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Finding the Fourth Proportional to 139,069.42, 191,919.58 and 78,649.10

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Solution

The fourth proportional to 139,069.42, 191,919.58 and 78,649.10 is: 108,537.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,069.42 : 191,919.58 = 78,649.10 : x
  2. Step 2: Convert to fraction form
    139,069.42/191,919.58 = 78,649.10/x
  3. Step 3: Cross multiply
    139,069.42x = 191,919.58 × 78,649.10
  4. Step 4: Simplify right side
    139,069.42x = 15,094,301,846.13
  5. Step 5: Solve for x
    x = 15,094,301,846.13/139,069.42
  6. Step 6: Final answer
    x = 108,537.89

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