Finding the Fourth Proportional to 3,900.88, 5,380.56 and 2,328.40

Step by Step Solution

1. Step 1: Write the proportion equation
   3,900.88 : 5,380.56 = 2,328.40 : x
2. Step 2: Convert to fraction form
   3,900.88/5,380.56 = 2,328.40/x
3. Step 3: Cross multiply
   3,900.88x = 5,380.56 × 2,328.40
4. Step 4: Simplify right side
   3,900.88x = 12,528,095.90
5. Step 5: Solve for x
   x = 12,528,095.90/3,900.88
6. Step 6: Final answer
   x = 3,211.61