Finding the Fourth Proportional to 11,416.50, 17,111.88 and 8,634.15

Step by Step Solution

1. Step 1: Write the proportion equation
   11,416.50 : 17,111.88 = 8,634.15 : x
2. Step 2: Convert to fraction form
   11,416.50/17,111.88 = 8,634.15/x
3. Step 3: Cross multiply
   11,416.50x = 17,111.88 × 8,634.15
4. Step 4: Simplify right side
   11,416.50x = 147,746,538.70
5. Step 5: Solve for x
   x = 147,746,538.70/11,416.50
6. Step 6: Final answer
   x = 12,941.49