Finding the Fourth Proportional to 1,158.52, 1,598.80 and 661.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158.52 : 1,598.80 = 661.20 : x
2. Step 2: Convert to fraction form
   1,158.52/1,598.80 = 661.20/x
3. Step 3: Cross multiply
   1,158.52x = 1,598.80 × 661.20
4. Step 4: Simplify right side
   1,158.52x = 1,057,126.56
5. Step 5: Solve for x
   x = 1,057,126.56/1,158.52
6. Step 6: Final answer
   x = 912.48