Finding the Fourth Proportional to 10,520.16, 15,781.83 and 3,123.69

Step by Step Solution

1. Step 1: Write the proportion equation
   10,520.16 : 15,781.83 = 3,123.69 : x
2. Step 2: Convert to fraction form
   10,520.16/15,781.83 = 3,123.69/x
3. Step 3: Cross multiply
   10,520.16x = 15,781.83 × 3,123.69
4. Step 4: Simplify right side
   10,520.16x = 49,297,544.55
5. Step 5: Solve for x
   x = 49,297,544.55/10,520.16
6. Step 6: Final answer
   x = 4,686.01