Finding the Fourth Proportional to 42,658.50, 63,960.38 and 17,715.78

Step by Step Solution

1. Step 1: Write the proportion equation
   42,658.50 : 63,960.38 = 17,715.78 : x
2. Step 2: Convert to fraction form
   42,658.50/63,960.38 = 17,715.78/x
3. Step 3: Cross multiply
   42,658.50x = 63,960.38 × 17,715.78
4. Step 4: Simplify right side
   42,658.50x = 1,133,108,020.80
5. Step 5: Solve for x
   x = 1,133,108,020.80/42,658.50
6. Step 6: Final answer
   x = 26,562.30