Finding the Fourth Proportional to 1,158.72, 1,737.54 and 671.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158.72 : 1,737.54 = 671.91 : x
2. Step 2: Convert to fraction form
   1,158.72/1,737.54 = 671.91/x
3. Step 3: Cross multiply
   1,158.72x = 1,737.54 × 671.91
4. Step 4: Simplify right side
   1,158.72x = 1,167,470.50
5. Step 5: Solve for x
   x = 1,167,470.50/1,158.72
6. Step 6: Final answer
   x = 1,007.55