Finding the Fourth Proportional to 3,123.78, 4,684.73 and 2,574.60

Step by Step Solution

1. Step 1: Write the proportion equation
   3,123.78 : 4,684.73 = 2,574.60 : x
2. Step 2: Convert to fraction form
   3,123.78/4,684.73 = 2,574.60/x
3. Step 3: Cross multiply
   3,123.78x = 4,684.73 × 2,574.60
4. Step 4: Simplify right side
   3,123.78x = 12,061,305.86
5. Step 5: Solve for x
   x = 12,061,305.86/3,123.78
6. Step 6: Final answer
   x = 3,861.13