Finding the Fourth Proportional to 742.96, 1,111.15 and 661.27

Step by Step Solution

1. Step 1: Write the proportion equation
   742.96 : 1,111.15 = 661.27 : x
2. Step 2: Convert to fraction form
   742.96/1,111.15 = 661.27/x
3. Step 3: Cross multiply
   742.96x = 1,111.15 × 661.27
4. Step 4: Simplify right side
   742.96x = 734,773.42
5. Step 5: Solve for x
   x = 734,773.42/742.96
6. Step 6: Final answer
   x = 988.99