Finding the Fourth Proportional to 1,010.22, 1,393.23 and 661.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,010.22 : 1,393.23 = 661.02 : x
2. Step 2: Convert to fraction form
   1,010.22/1,393.23 = 661.02/x
3. Step 3: Cross multiply
   1,010.22x = 1,393.23 × 661.02
4. Step 4: Simplify right side
   1,010.22x = 920,952.89
5. Step 5: Solve for x
   x = 920,952.89/1,010.22
6. Step 6: Final answer
   x = 911.64