Finding the Fourth Proportional to 12,425.32, 17,147.35 and 7,121.15

Step by Step Solution

1. Step 1: Write the proportion equation
   12,425.32 : 17,147.35 = 7,121.15 : x
2. Step 2: Convert to fraction form
   12,425.32/17,147.35 = 7,121.15/x
3. Step 3: Cross multiply
   12,425.32x = 17,147.35 × 7,121.15
4. Step 4: Simplify right side
   12,425.32x = 122,108,798.86
5. Step 5: Solve for x
   x = 122,108,798.86/12,425.32
6. Step 6: Final answer
   x = 9,827.42