Finding the Fourth Proportional to 1,082.30, 1,493.34 and 640.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,082.30 : 1,493.34 = 640.34 : x
2. Step 2: Convert to fraction form
   1,082.30/1,493.34 = 640.34/x
3. Step 3: Cross multiply
   1,082.30x = 1,493.34 × 640.34
4. Step 4: Simplify right side
   1,082.30x = 956,241.07
5. Step 5: Solve for x
   x = 956,241.07/1,082.30
6. Step 6: Final answer
   x = 883.53