Finding the Fourth Proportional to 1,016.64, 1,402.24 and 661.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,016.64 : 1,402.24 = 661.91 : x
2. Step 2: Convert to fraction form
   1,016.64/1,402.24 = 661.91/x
3. Step 3: Cross multiply
   1,016.64x = 1,402.24 × 661.91
4. Step 4: Simplify right side
   1,016.64x = 928,153.37
5. Step 5: Solve for x
   x = 928,153.37/1,016.64
6. Step 6: Final answer
   x = 912.96