Finding the Fourth Proportional to 1,082.82, 1,493.95 and 640.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,082.82 : 1,493.95 = 640.56 : x
2. Step 2: Convert to fraction form
   1,082.82/1,493.95 = 640.56/x
3. Step 3: Cross multiply
   1,082.82x = 1,493.95 × 640.56
4. Step 4: Simplify right side
   1,082.82x = 956,964.61
5. Step 5: Solve for x
   x = 956,964.61/1,082.82
6. Step 6: Final answer
   x = 883.77