Finding the Fourth Proportional to 1,158.39, 1,598.60 and 661.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158.39 : 1,598.60 = 661.01 : x
2. Step 2: Convert to fraction form
   1,158.39/1,598.60 = 661.01/x
3. Step 3: Cross multiply
   1,158.39x = 1,598.60 × 661.01
4. Step 4: Simplify right side
   1,158.39x = 1,056,684.25
5. Step 5: Solve for x
   x = 1,056,684.25/1,158.39
6. Step 6: Final answer
   x = 912.20