Finding the Fourth Proportional to 8,899.02, 12,280.77 and 4,920.05

Step by Step Solution

1. Step 1: Write the proportion equation
   8,899.02 : 12,280.77 = 4,920.05 : x
2. Step 2: Convert to fraction form
   8,899.02/12,280.77 = 4,920.05/x
3. Step 3: Cross multiply
   8,899.02x = 12,280.77 × 4,920.05
4. Step 4: Simplify right side
   8,899.02x = 60,421,941.03
5. Step 5: Solve for x
   x = 60,421,941.03/8,899.02
6. Step 6: Final answer
   x = 6,789.73