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Finding the Fourth Proportional to 138,689.57, 191,389.74 and 77,436.71

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Solution

The fourth proportional to 138,689.57, 191,389.74 and 77,436.71 is: 106,861.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,689.57 : 191,389.74 = 77,436.71 : x
  2. Step 2: Convert to fraction form
    138,689.57/191,389.74 = 77,436.71/x
  3. Step 3: Cross multiply
    138,689.57x = 191,389.74 × 77,436.71
  4. Step 4: Simplify right side
    138,689.57x = 14,820,590,836.41
  5. Step 5: Solve for x
    x = 14,820,590,836.41/138,689.57
  6. Step 6: Final answer
    x = 106,861.61

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