Finding the Fourth Proportional to 1,150.39, 1,722.75 and 661.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,150.39 : 1,722.75 = 661.96 : x
2. Step 2: Convert to fraction form
   1,150.39/1,722.75 = 661.96/x
3. Step 3: Cross multiply
   1,150.39x = 1,722.75 × 661.96
4. Step 4: Simplify right side
   1,150.39x = 1,140,391.59
5. Step 5: Solve for x
   x = 1,140,391.59/1,150.39
6. Step 6: Final answer
   x = 991.31