Finding the Fourth Proportional to 1,082.54, 1,493.88 and 640.41

Step by Step Solution

1. Step 1: Write the proportion equation
   1,082.54 : 1,493.88 = 640.41 : x
2. Step 2: Convert to fraction form
   1,082.54/1,493.88 = 640.41/x
3. Step 3: Cross multiply
   1,082.54x = 1,493.88 × 640.41
4. Step 4: Simplify right side
   1,082.54x = 956,695.69
5. Step 5: Solve for x
   x = 956,695.69/1,082.54
6. Step 6: Final answer
   x = 883.75