Finding the Fourth Proportional to 1,010.32, 1,393.32 and 661.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,010.32 : 1,393.32 = 661.12 : x
2. Step 2: Convert to fraction form
   1,010.32/1,393.32 = 661.12/x
3. Step 3: Cross multiply
   1,010.32x = 1,393.32 × 661.12
4. Step 4: Simplify right side
   1,010.32x = 921,151.72
5. Step 5: Solve for x
   x = 921,151.72/1,010.32
6. Step 6: Final answer
   x = 911.74