Finding the Fourth Proportional to 1,149.46, 1,722.82 and 661.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,149.46 : 1,722.82 = 661.50 : x
2. Step 2: Convert to fraction form
   1,149.46/1,722.82 = 661.50/x
3. Step 3: Cross multiply
   1,149.46x = 1,722.82 × 661.50
4. Step 4: Simplify right side
   1,149.46x = 1,139,645.43
5. Step 5: Solve for x
   x = 1,139,645.43/1,149.46
6. Step 6: Final answer
   x = 991.46