Finding the Fourth Proportional to 1,150.79, 1,588.13 and 685.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,150.79 : 1,588.13 = 685.31 : x
2. Step 2: Convert to fraction form
   1,150.79/1,588.13 = 685.31/x
3. Step 3: Cross multiply
   1,150.79x = 1,588.13 × 685.31
4. Step 4: Simplify right side
   1,150.79x = 1,088,350.00
5. Step 5: Solve for x
   x = 1,088,350.00/1,150.79
6. Step 6: Final answer
   x = 945.75