Finding the Fourth Proportional to 11,409.40, 15,755.79 and 10,788.15

Step by Step Solution

1. Step 1: Write the proportion equation
   11,409.40 : 15,755.79 = 10,788.15 : x
2. Step 2: Convert to fraction form
   11,409.40/15,755.79 = 10,788.15/x
3. Step 3: Cross multiply
   11,409.40x = 15,755.79 × 10,788.15
4. Step 4: Simplify right side
   11,409.40x = 169,975,825.89
5. Step 5: Solve for x
   x = 169,975,825.89/11,409.40
6. Step 6: Final answer
   x = 14,897.88