Finding the Fourth Proportional to 1,158.75, 1,599.17 and 661.41

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158.75 : 1,599.17 = 661.41 : x
2. Step 2: Convert to fraction form
   1,158.75/1,599.17 = 661.41/x
3. Step 3: Cross multiply
   1,158.75x = 1,599.17 × 661.41
4. Step 4: Simplify right side
   1,158.75x = 1,057,703.72
5. Step 5: Solve for x
   x = 1,057,703.72/1,158.75
6. Step 6: Final answer
   x = 912.80