Finding the Fourth Proportional to 1,158.47, 1,598.70 and 661.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158.47 : 1,598.70 = 661.12 : x
2. Step 2: Convert to fraction form
   1,158.47/1,598.70 = 661.12/x
3. Step 3: Cross multiply
   1,158.47x = 1,598.70 × 661.12
4. Step 4: Simplify right side
   1,158.47x = 1,056,932.54
5. Step 5: Solve for x
   x = 1,056,932.54/1,158.47
6. Step 6: Final answer
   x = 912.35