Finding the Fourth Proportional to 10,780.47, 14,873.49 and 8,787.60

Step by Step Solution

1. Step 1: Write the proportion equation
   10,780.47 : 14,873.49 = 8,787.60 : x
2. Step 2: Convert to fraction form
   10,780.47/14,873.49 = 8,787.60/x
3. Step 3: Cross multiply
   10,780.47x = 14,873.49 × 8,787.60
4. Step 4: Simplify right side
   10,780.47x = 130,702,280.72
5. Step 5: Solve for x
   x = 130,702,280.72/10,780.47
6. Step 6: Final answer
   x = 12,123.99