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Finding the Fourth Proportional to 86,543.40, 129,815.10 and 69,047.40

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Solution

The fourth proportional to 86,543.40, 129,815.10 and 69,047.40 is: 103,571.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,543.40 : 129,815.10 = 69,047.40 : x
  2. Step 2: Convert to fraction form
    86,543.40/129,815.10 = 69,047.40/x
  3. Step 3: Cross multiply
    86,543.40x = 129,815.10 × 69,047.40
  4. Step 4: Simplify right side
    86,543.40x = 8,963,395,135.74
  5. Step 5: Solve for x
    x = 8,963,395,135.74/86,543.40
  6. Step 6: Final answer
    x = 103,571.10

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