Finding the Fourth Proportional to 8,899.02, 12,279.32 and 4,920.30

Step by Step Solution

1. Step 1: Write the proportion equation
   8,899.02 : 12,279.32 = 4,920.30 : x
2. Step 2: Convert to fraction form
   8,899.02/12,279.32 = 4,920.30/x
3. Step 3: Cross multiply
   8,899.02x = 12,279.32 × 4,920.30
4. Step 4: Simplify right side
   8,899.02x = 60,417,938.20
5. Step 5: Solve for x
   x = 60,417,938.20/8,899.02
6. Step 6: Final answer
   x = 6,789.28