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Finding the Fourth Proportional to 8,720.80, 13,079.80 and 3,789.11

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Solution

The fourth proportional to 8,720.80, 13,079.80 and 3,789.11 is: 5,683.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,720.80 : 13,079.80 = 3,789.11 : x
  2. Step 2: Convert to fraction form
    8,720.80/13,079.80 = 3,789.11/x
  3. Step 3: Cross multiply
    8,720.80x = 13,079.80 × 3,789.11
  4. Step 4: Simplify right side
    8,720.80x = 49,560,800.98
  5. Step 5: Solve for x
    x = 49,560,800.98/8,720.80
  6. Step 6: Final answer
    x = 5,683.06

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