Finding the Fourth Proportional to 16,957.98, 25,435.35 and 10,380.78

Step by Step Solution

1. Step 1: Write the proportion equation
   16,957.98 : 25,435.35 = 10,380.78 : x
2. Step 2: Convert to fraction form
   16,957.98/25,435.35 = 10,380.78/x
3. Step 3: Cross multiply
   16,957.98x = 25,435.35 × 10,380.78
4. Step 4: Simplify right side
   16,957.98x = 264,038,772.57
5. Step 5: Solve for x
   x = 264,038,772.57/16,957.98
6. Step 6: Final answer
   x = 15,570.18