Finding the Fourth Proportional to 10,773.72, 14,864.16 and 8,780.85

Step by Step Solution

1. Step 1: Write the proportion equation
   10,773.72 : 14,864.16 = 8,780.85 : x
2. Step 2: Convert to fraction form
   10,773.72/14,864.16 = 8,780.85/x
3. Step 3: Cross multiply
   10,773.72x = 14,864.16 × 8,780.85
4. Step 4: Simplify right side
   10,773.72x = 130,519,959.34
5. Step 5: Solve for x
   x = 130,519,959.34/10,773.72
6. Step 6: Final answer
   x = 12,114.66