Finding the Fourth Proportional to 10,520.75, 15,778.43 and 3,123.50

Step by Step Solution

1. Step 1: Write the proportion equation
   10,520.75 : 15,778.43 = 3,123.50 : x
2. Step 2: Convert to fraction form
   10,520.75/15,778.43 = 3,123.50/x
3. Step 3: Cross multiply
   10,520.75x = 15,778.43 × 3,123.50
4. Step 4: Simplify right side
   10,520.75x = 49,283,843.31
5. Step 5: Solve for x
   x = 49,283,843.31/10,520.75
6. Step 6: Final answer
   x = 4,684.44