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Finding the Fourth Proportional to 5,216.21, 7,824.32 and 1,320.61

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Solution

The fourth proportional to 5,216.21, 7,824.32 and 1,320.61 is: 1,980.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,216.21 : 7,824.32 = 1,320.61 : x
  2. Step 2: Convert to fraction form
    5,216.21/7,824.32 = 1,320.61/x
  3. Step 3: Cross multiply
    5,216.21x = 7,824.32 × 1,320.61
  4. Step 4: Simplify right side
    5,216.21x = 10,332,875.24
  5. Step 5: Solve for x
    x = 10,332,875.24/5,216.21
  6. Step 6: Final answer
    x = 1,980.92

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