Finding the Fourth Proportional to 1,158.23, 1,598.56 and 660.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158.23 : 1,598.56 = 660.91 : x
2. Step 2: Convert to fraction form
   1,158.23/1,598.56 = 660.91/x
3. Step 3: Cross multiply
   1,158.23x = 1,598.56 × 660.91
4. Step 4: Simplify right side
   1,158.23x = 1,056,498.64
5. Step 5: Solve for x
   x = 1,056,498.64/1,158.23
6. Step 6: Final answer
   x = 912.17