Finding the Fourth Proportional to 8,899.42, 12,280.59 and 4,920.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,899.42 : 12,280.59 = 4,920.50 : x
2. Step 2: Convert to fraction form
   8,899.42/12,280.59 = 4,920.50/x
3. Step 3: Cross multiply
   8,899.42x = 12,280.59 × 4,920.50
4. Step 4: Simplify right side
   8,899.42x = 60,426,581.69
5. Step 5: Solve for x
   x = 60,426,581.69/8,899.42
6. Step 6: Final answer
   x = 6,789.95