Finding the Fourth Proportional to 12,976.36, 17,912.82 and 8,787.04

Step by Step Solution

1. Step 1: Write the proportion equation
   12,976.36 : 17,912.82 = 8,787.04 : x
2. Step 2: Convert to fraction form
   12,976.36/17,912.82 = 8,787.04/x
3. Step 3: Cross multiply
   12,976.36x = 17,912.82 × 8,787.04
4. Step 4: Simplify right side
   12,976.36x = 157,400,665.85
5. Step 5: Solve for x
   x = 157,400,665.85/12,976.36
6. Step 6: Final answer
   x = 12,129.80