Finding the Fourth Proportional to 8,309.92, 12,461.22 and 3,112.15

Step by Step Solution

1. Step 1: Write the proportion equation
   8,309.92 : 12,461.22 = 3,112.15 : x
2. Step 2: Convert to fraction form
   8,309.92/12,461.22 = 3,112.15/x
3. Step 3: Cross multiply
   8,309.92x = 12,461.22 × 3,112.15
4. Step 4: Simplify right side
   8,309.92x = 38,781,123.52
5. Step 5: Solve for x
   x = 38,781,123.52/8,309.92
6. Step 6: Final answer
   x = 4,666.85