Finding the Fourth Proportional to 11,376.72, 17,076.15 and 8,699.40

Step by Step Solution

1. Step 1: Write the proportion equation
   11,376.72 : 17,076.15 = 8,699.40 : x
2. Step 2: Convert to fraction form
   11,376.72/17,076.15 = 8,699.40/x
3. Step 3: Cross multiply
   11,376.72x = 17,076.15 × 8,699.40
4. Step 4: Simplify right side
   11,376.72x = 148,552,259.31
5. Step 5: Solve for x
   x = 148,552,259.31/11,376.72
6. Step 6: Final answer
   x = 13,057.56