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Finding the Fourth Proportional to 139,968,399.80, 209,952,599.70 and 78,494,454.20

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Solution

The fourth proportional to 139,968,399.80, 209,952,599.70 and 78,494,454.20 is: 117,741,681.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,968,399.80 : 209,952,599.70 = 78,494,454.20 : x
  2. Step 2: Convert to fraction form
    139,968,399.80/209,952,599.70 = 78,494,454.20/x
  3. Step 3: Cross multiply
    139,968,399.80x = 209,952,599.70 × 78,494,454.20
  4. Step 4: Simplify right side
    139,968,399.80x = 16,480,114,721,322,584
  5. Step 5: Solve for x
    x = 16,480,114,721,322,584/139,968,399.80
  6. Step 6: Final answer
    x = 117,741,681.30

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