Finding the Fourth Proportional to 17,142.54, 23,655.15 and 10,854.78

Step by Step Solution

1. Step 1: Write the proportion equation
   17,142.54 : 23,655.15 = 10,854.78 : x
2. Step 2: Convert to fraction form
   17,142.54/23,655.15 = 10,854.78/x
3. Step 3: Cross multiply
   17,142.54x = 23,655.15 × 10,854.78
4. Step 4: Simplify right side
   17,142.54x = 256,771,449.12
5. Step 5: Solve for x
   x = 256,771,449.12/17,142.54
6. Step 6: Final answer
   x = 14,978.61