Finding the Fourth Proportional to 10,577.28, 15,869.76 and 8,641.92

Step by Step Solution

1. Step 1: Write the proportion equation
   10,577.28 : 15,869.76 = 8,641.92 : x
2. Step 2: Convert to fraction form
   10,577.28/15,869.76 = 8,641.92/x
3. Step 3: Cross multiply
   10,577.28x = 15,869.76 × 8,641.92
4. Step 4: Simplify right side
   10,577.28x = 137,145,196.34
5. Step 5: Solve for x
   x = 137,145,196.34/10,577.28
6. Step 6: Final answer
   x = 12,966.02