Finding the Fourth Proportional to 3,123.90, 4,311.54 and 2,376.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,123.90 : 4,311.54 = 2,376.72 : x
2. Step 2: Convert to fraction form
   3,123.90/4,311.54 = 2,376.72/x
3. Step 3: Cross multiply
   3,123.90x = 4,311.54 × 2,376.72
4. Step 4: Simplify right side
   3,123.90x = 10,247,323.35
5. Step 5: Solve for x
   x = 10,247,323.35/3,123.90
6. Step 6: Final answer
   x = 3,280.30