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Finding the Fourth Proportional to 72,990.72, 100,726.92 and 39,456.72

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Solution

The fourth proportional to 72,990.72, 100,726.92 and 39,456.72 is: 54,450.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,990.72 : 100,726.92 = 39,456.72 : x
  2. Step 2: Convert to fraction form
    72,990.72/100,726.92 = 39,456.72/x
  3. Step 3: Cross multiply
    72,990.72x = 100,726.92 × 39,456.72
  4. Step 4: Simplify right side
    72,990.72x = 3,974,353,878.90
  5. Step 5: Solve for x
    x = 3,974,353,878.90/72,990.72
  6. Step 6: Final answer
    x = 54,450.13

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