Finding the Fourth Proportional to 8,399.31, 12,600.78 and 2,555.77

Step by Step Solution

1. Step 1: Write the proportion equation
   8,399.31 : 12,600.78 = 2,555.77 : x
2. Step 2: Convert to fraction form
   8,399.31/12,600.78 = 2,555.77/x
3. Step 3: Cross multiply
   8,399.31x = 12,600.78 × 2,555.77
4. Step 4: Simplify right side
   8,399.31x = 32,204,695.50
5. Step 5: Solve for x
   x = 32,204,695.50/8,399.31
6. Step 6: Final answer
   x = 3,834.21