Finding the Fourth Proportional to 1,158.35, 1,598.42 and 661.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158.35 : 1,598.42 = 661.10 : x
2. Step 2: Convert to fraction form
   1,158.35/1,598.42 = 661.10/x
3. Step 3: Cross multiply
   1,158.35x = 1,598.42 × 661.10
4. Step 4: Simplify right side
   1,158.35x = 1,056,712.16
5. Step 5: Solve for x
   x = 1,056,712.16/1,158.35
6. Step 6: Final answer
   x = 912.26