Finding the Fourth Proportional to 8,899.55, 12,280.43 and 4,920.02

Step by Step Solution

1. Step 1: Write the proportion equation
   8,899.55 : 12,280.43 = 4,920.02 : x
2. Step 2: Convert to fraction form
   8,899.55/12,280.43 = 4,920.02/x
3. Step 3: Cross multiply
   8,899.55x = 12,280.43 × 4,920.02
4. Step 4: Simplify right side
   8,899.55x = 60,419,912.11
5. Step 5: Solve for x
   x = 60,419,912.11/8,899.55
6. Step 6: Final answer
   x = 6,789.10