Finding the Fourth Proportional to 215,441.69, 297,354.60 and 129,404.43

Step by Step Solution

1. Step 1: Write the proportion equation
   215,441.69 : 297,354.60 = 129,404.43 : x
2. Step 2: Convert to fraction form
   215,441.69/297,354.60 = 129,404.43/x
3. Step 3: Cross multiply
   215,441.69x = 297,354.60 × 129,404.43
4. Step 4: Simplify right side
   215,441.69x = 38,479,002,520.88
5. Step 5: Solve for x
   x = 38,479,002,520.88/215,441.69
6. Step 6: Final answer
   x = 178,605.19