Finding the Fourth Proportional to 12,398.86, 17,102.10 and 7,685.47

Step by Step Solution

1. Step 1: Write the proportion equation
   12,398.86 : 17,102.10 = 7,685.47 : x
2. Step 2: Convert to fraction form
   12,398.86/17,102.10 = 7,685.47/x
3. Step 3: Cross multiply
   12,398.86x = 17,102.10 × 7,685.47
4. Step 4: Simplify right side
   12,398.86x = 131,437,676.49
5. Step 5: Solve for x
   x = 131,437,676.49/12,398.86
6. Step 6: Final answer
   x = 10,600.79