Finding the Fourth Proportional to 3,902.95, 5,385.98 and 2,391.10

Step by Step Solution

1. Step 1: Write the proportion equation
   3,902.95 : 5,385.98 = 2,391.10 : x
2. Step 2: Convert to fraction form
   3,902.95/5,385.98 = 2,391.10/x
3. Step 3: Cross multiply
   3,902.95x = 5,385.98 × 2,391.10
4. Step 4: Simplify right side
   3,902.95x = 12,878,424.86
5. Step 5: Solve for x
   x = 12,878,424.86/3,902.95
6. Step 6: Final answer
   x = 3,299.66