Finding the Fourth Proportional to 17,155.56, 25,725.12 and 8,380.20

Step by Step Solution

1. Step 1: Write the proportion equation
   17,155.56 : 25,725.12 = 8,380.20 : x
2. Step 2: Convert to fraction form
   17,155.56/25,725.12 = 8,380.20/x
3. Step 3: Cross multiply
   17,155.56x = 25,725.12 × 8,380.20
4. Step 4: Simplify right side
   17,155.56x = 215,581,650.62
5. Step 5: Solve for x
   x = 215,581,650.62/17,155.56
6. Step 6: Final answer
   x = 12,566.28