Finding the Fourth Proportional to 12,402.10, 17,114.43 and 7,686.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,402.10 : 17,114.43 = 7,686.28 : x
2. Step 2: Convert to fraction form
   12,402.10/17,114.43 = 7,686.28/x
3. Step 3: Cross multiply
   12,402.10x = 17,114.43 × 7,686.28
4. Step 4: Simplify right side
   12,402.10x = 131,546,301.02
5. Step 5: Solve for x
   x = 131,546,301.02/12,402.10
6. Step 6: Final answer
   x = 10,606.78