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Finding the Fourth Proportional to 71,891.79, 99,209.32 and 39,186.47

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Solution

The fourth proportional to 71,891.79, 99,209.32 and 39,186.47 is: 54,076.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,891.79 : 99,209.32 = 39,186.47 : x
  2. Step 2: Convert to fraction form
    71,891.79/99,209.32 = 39,186.47/x
  3. Step 3: Cross multiply
    71,891.79x = 99,209.32 × 39,186.47
  4. Step 4: Simplify right side
    71,891.79x = 3,887,663,041.90
  5. Step 5: Solve for x
    x = 3,887,663,041.90/71,891.79
  6. Step 6: Final answer
    x = 54,076.59

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