Finding the Fourth Proportional to 1,158.73, 1,736.49 and 638.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158.73 : 1,736.49 = 638.10 : x
2. Step 2: Convert to fraction form
   1,158.73/1,736.49 = 638.10/x
3. Step 3: Cross multiply
   1,158.73x = 1,736.49 × 638.10
4. Step 4: Simplify right side
   1,158.73x = 1,108,057.96
5. Step 5: Solve for x
   x = 1,108,057.96/1,158.73
6. Step 6: Final answer
   x = 956.27