Finding the Fourth Proportional to 8,320.92, 12,477.72 and 3,123.15

Step by Step Solution

1. Step 1: Write the proportion equation
   8,320.92 : 12,477.72 = 3,123.15 : x
2. Step 2: Convert to fraction form
   8,320.92/12,477.72 = 3,123.15/x
3. Step 3: Cross multiply
   8,320.92x = 12,477.72 × 3,123.15
4. Step 4: Simplify right side
   8,320.92x = 38,969,791.22
5. Step 5: Solve for x
   x = 38,969,791.22/8,320.92
6. Step 6: Final answer
   x = 4,683.35