Finding the Fourth Proportional to 1,158.41, 1,598.60 and 661.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158.41 : 1,598.60 = 661.05 : x
2. Step 2: Convert to fraction form
   1,158.41/1,598.60 = 661.05/x
3. Step 3: Cross multiply
   1,158.41x = 1,598.60 × 661.05
4. Step 4: Simplify right side
   1,158.41x = 1,056,751.22
5. Step 5: Solve for x
   x = 1,056,751.22/1,158.41
6. Step 6: Final answer
   x = 912.25