Finding the Fourth Proportional to 10,557.88, 14,568.32 and 8,970.90

Step by Step Solution

1. Step 1: Write the proportion equation
   10,557.88 : 14,568.32 = 8,970.90 : x
2. Step 2: Convert to fraction form
   10,557.88/14,568.32 = 8,970.90/x
3. Step 3: Cross multiply
   10,557.88x = 14,568.32 × 8,970.90
4. Step 4: Simplify right side
   10,557.88x = 130,690,941.89
5. Step 5: Solve for x
   x = 130,690,941.89/10,557.88
6. Step 6: Final answer
   x = 12,378.52