Finding the Fourth Proportional to 10,641.11, 14,660.26 and 8,402.15

Step by Step Solution

1. Step 1: Write the proportion equation
   10,641.11 : 14,660.26 = 8,402.15 : x
2. Step 2: Convert to fraction form
   10,641.11/14,660.26 = 8,402.15/x
3. Step 3: Cross multiply
   10,641.11x = 14,660.26 × 8,402.15
4. Step 4: Simplify right side
   10,641.11x = 123,177,719.20
5. Step 5: Solve for x
   x = 123,177,719.20/10,641.11
6. Step 6: Final answer
   x = 11,575.65