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Finding the Fourth Proportional to 2,978.58, 4,465.27 and 1,129.21

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Solution

The fourth proportional to 2,978.58, 4,465.27 and 1,129.21 is: 1,692.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,978.58 : 4,465.27 = 1,129.21 : x
  2. Step 2: Convert to fraction form
    2,978.58/4,465.27 = 1,129.21/x
  3. Step 3: Cross multiply
    2,978.58x = 4,465.27 × 1,129.21
  4. Step 4: Simplify right side
    2,978.58x = 5,042,227.54
  5. Step 5: Solve for x
    x = 5,042,227.54/2,978.58
  6. Step 6: Final answer
    x = 1,692.83

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