Finding the Fourth Proportional to 1,158.60, 1,598.88 and 661.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158.60 : 1,598.88 = 661.25 : x
2. Step 2: Convert to fraction form
   1,158.60/1,598.88 = 661.25/x
3. Step 3: Cross multiply
   1,158.60x = 1,598.88 × 661.25
4. Step 4: Simplify right side
   1,158.60x = 1,057,251.41
5. Step 5: Solve for x
   x = 1,057,251.41/1,158.60
6. Step 6: Final answer
   x = 912.52