Finding the Fourth Proportional to 17,111.60, 25,661.34 and 10,517.96

Step by Step Solution

1. Step 1: Write the proportion equation
   17,111.60 : 25,661.34 = 10,517.96 : x
2. Step 2: Convert to fraction form
   17,111.60/25,661.34 = 10,517.96/x
3. Step 3: Cross multiply
   17,111.60x = 25,661.34 × 10,517.96
4. Step 4: Simplify right side
   17,111.60x = 269,904,947.67
5. Step 5: Solve for x
   x = 269,904,947.67/17,111.60
6. Step 6: Final answer
   x = 15,773.22