Finding the Fourth Proportional to 1,158.38, 1,734.45 and 609.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158.38 : 1,734.45 = 609.40 : x
2. Step 2: Convert to fraction form
   1,158.38/1,734.45 = 609.40/x
3. Step 3: Cross multiply
   1,158.38x = 1,734.45 × 609.40
4. Step 4: Simplify right side
   1,158.38x = 1,056,973.83
5. Step 5: Solve for x
   x = 1,056,973.83/1,158.38
6. Step 6: Final answer
   x = 912.46