Finding the Fourth Proportional to 1,016.42, 1,401.93 and 661.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,016.42 : 1,401.93 = 661.69 : x
2. Step 2: Convert to fraction form
   1,016.42/1,401.93 = 661.69/x
3. Step 3: Cross multiply
   1,016.42x = 1,401.93 × 661.69
4. Step 4: Simplify right side
   1,016.42x = 927,639.56
5. Step 5: Solve for x
   x = 927,639.56/1,016.42
6. Step 6: Final answer
   x = 912.66