Finding the Fourth Proportional to 1,158.63, 1,598.70 and 661.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158.63 : 1,598.70 = 661.17 : x
2. Step 2: Convert to fraction form
   1,158.63/1,598.70 = 661.17/x
3. Step 3: Cross multiply
   1,158.63x = 1,598.70 × 661.17
4. Step 4: Simplify right side
   1,158.63x = 1,057,012.48
5. Step 5: Solve for x
   x = 1,057,012.48/1,158.63
6. Step 6: Final answer
   x = 912.30