Finding the Fourth Proportional to 8,899.31, 12,280.12 and 4,919.87

Step by Step Solution

1. Step 1: Write the proportion equation
   8,899.31 : 12,280.12 = 4,919.87 : x
2. Step 2: Convert to fraction form
   8,899.31/12,280.12 = 4,919.87/x
3. Step 3: Cross multiply
   8,899.31x = 12,280.12 × 4,919.87
4. Step 4: Simplify right side
   8,899.31x = 60,416,612.39
5. Step 5: Solve for x
   x = 60,416,612.39/8,899.31
6. Step 6: Final answer
   x = 6,788.91