Finding the Fourth Proportional to 2,391.32, 3,299.76 and 1,396.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,391.32 : 3,299.76 = 1,396.40 : x
2. Step 2: Convert to fraction form
   2,391.32/3,299.76 = 1,396.40/x
3. Step 3: Cross multiply
   2,391.32x = 3,299.76 × 1,396.40
4. Step 4: Simplify right side
   2,391.32x = 4,607,784.86
5. Step 5: Solve for x
   x = 4,607,784.86/2,391.32
6. Step 6: Final answer
   x = 1,926.88