Finding the Fourth Proportional to 17,145.54, 23,659.29 and 10,857.78

Step by Step Solution

1. Step 1: Write the proportion equation
   17,145.54 : 23,659.29 = 10,857.78 : x
2. Step 2: Convert to fraction form
   17,145.54/23,659.29 = 10,857.78/x
3. Step 3: Cross multiply
   17,145.54x = 23,659.29 × 10,857.78
4. Step 4: Simplify right side
   17,145.54x = 256,887,365.78
5. Step 5: Solve for x
   x = 256,887,365.78/17,145.54
6. Step 6: Final answer
   x = 14,982.75