Finding the Fourth Proportional to 8,899.91, 12,281.38 and 4,920.79

Step by Step Solution

1. Step 1: Write the proportion equation
   8,899.91 : 12,281.38 = 4,920.79 : x
2. Step 2: Convert to fraction form
   8,899.91/12,281.38 = 4,920.79/x
3. Step 3: Cross multiply
   8,899.91x = 12,281.38 × 4,920.79
4. Step 4: Simplify right side
   8,899.91x = 60,434,091.89
5. Step 5: Solve for x
   x = 60,434,091.89/8,899.91
6. Step 6: Final answer
   x = 6,790.42