Finding the Fourth Proportional to 8,899.29, 12,280.52 and 4,920.16

Step by Step Solution

1. Step 1: Write the proportion equation
   8,899.29 : 12,280.52 = 4,920.16 : x
2. Step 2: Convert to fraction form
   8,899.29/12,280.52 = 4,920.16/x
3. Step 3: Cross multiply
   8,899.29x = 12,280.52 × 4,920.16
4. Step 4: Simplify right side
   8,899.29x = 60,422,123.28
5. Step 5: Solve for x
   x = 60,422,123.28/8,899.29
6. Step 6: Final answer
   x = 6,789.55