Finding the Fourth Proportional to 10,787.90, 14,849.88 and 9,300.74

Step by Step Solution

1. Step 1: Write the proportion equation
   10,787.90 : 14,849.88 = 9,300.74 : x
2. Step 2: Convert to fraction form
   10,787.90/14,849.88 = 9,300.74/x
3. Step 3: Cross multiply
   10,787.90x = 14,849.88 × 9,300.74
4. Step 4: Simplify right side
   10,787.90x = 138,114,872.91
5. Step 5: Solve for x
   x = 138,114,872.91/10,787.90
6. Step 6: Final answer
   x = 12,802.76