Finding the Fourth Proportional to 2,393.55, 3,591.64 and 913.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,393.55 : 3,591.64 = 913.78 : x
2. Step 2: Convert to fraction form
   2,393.55/3,591.64 = 913.78/x
3. Step 3: Cross multiply
   2,393.55x = 3,591.64 × 913.78
4. Step 4: Simplify right side
   2,393.55x = 3,281,974.43
5. Step 5: Solve for x
   x = 3,281,974.43/2,393.55
6. Step 6: Final answer
   x = 1,371.17