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Finding the Fourth Proportional to 7,728.80, 10,664.80 and 5,371.70

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Solution

The fourth proportional to 7,728.80, 10,664.80 and 5,371.70 is: 7,412.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,728.80 : 10,664.80 = 5,371.70 : x
  2. Step 2: Convert to fraction form
    7,728.80/10,664.80 = 5,371.70/x
  3. Step 3: Cross multiply
    7,728.80x = 10,664.80 × 5,371.70
  4. Step 4: Simplify right side
    7,728.80x = 57,288,039.41
  5. Step 5: Solve for x
    x = 57,288,039.41/7,728.80
  6. Step 6: Final answer
    x = 7,412.29

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