Finding the Fourth Proportional to 1,016.26, 1,401.72 and 661.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,016.26 : 1,401.72 = 661.53 : x
2. Step 2: Convert to fraction form
   1,016.26/1,401.72 = 661.53/x
3. Step 3: Cross multiply
   1,016.26x = 1,401.72 × 661.53
4. Step 4: Simplify right side
   1,016.26x = 927,279.83
5. Step 5: Solve for x
   x = 927,279.83/1,016.26
6. Step 6: Final answer
   x = 912.44