Finding the Fourth Proportional to 17,150.72, 25,731.60 and 8,386.40

Step by Step Solution

1. Step 1: Write the proportion equation
   17,150.72 : 25,731.60 = 8,386.40 : x
2. Step 2: Convert to fraction form
   17,150.72/25,731.60 = 8,386.40/x
3. Step 3: Cross multiply
   17,150.72x = 25,731.60 × 8,386.40
4. Step 4: Simplify right side
   17,150.72x = 215,795,490.24
5. Step 5: Solve for x
   x = 215,795,490.24/17,150.72
6. Step 6: Final answer
   x = 12,582.30