Finding the Fourth Proportional to 8,787.02, 12,128.91 and 5,805.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,787.02 : 12,128.91 = 5,805.50 : x
2. Step 2: Convert to fraction form
   8,787.02/12,128.91 = 5,805.50/x
3. Step 3: Cross multiply
   8,787.02x = 12,128.91 × 5,805.50
4. Step 4: Simplify right side
   8,787.02x = 70,414,387.01
5. Step 5: Solve for x
   x = 70,414,387.01/8,787.02
6. Step 6: Final answer
   x = 8,013.45