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Finding the Fourth Proportional to 13,581.27, 20,339.10 and 7,720.11

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Solution

The fourth proportional to 13,581.27, 20,339.10 and 7,720.11 is: 11,561.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,581.27 : 20,339.10 = 7,720.11 : x
  2. Step 2: Convert to fraction form
    13,581.27/20,339.10 = 7,720.11/x
  3. Step 3: Cross multiply
    13,581.27x = 20,339.10 × 7,720.11
  4. Step 4: Simplify right side
    13,581.27x = 157,020,089.30
  5. Step 5: Solve for x
    x = 157,020,089.30/13,581.27
  6. Step 6: Final answer
    x = 11,561.52

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