Finding the Fourth Proportional to 16,706.10, 25,010.55 and 10,128.90

Step by Step Solution

1. Step 1: Write the proportion equation
   16,706.10 : 25,010.55 = 10,128.90 : x
2. Step 2: Convert to fraction form
   16,706.10/25,010.55 = 10,128.90/x
3. Step 3: Cross multiply
   16,706.10x = 25,010.55 × 10,128.90
4. Step 4: Simplify right side
   16,706.10x = 253,329,359.90
5. Step 5: Solve for x
   x = 253,329,359.90/16,706.10
6. Step 6: Final answer
   x = 15,163.88