Finding the Fourth Proportional to 1,020.72, 1,409.22 and 648.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,020.72 : 1,409.22 = 648.24 : x
2. Step 2: Convert to fraction form
   1,020.72/1,409.22 = 648.24/x
3. Step 3: Cross multiply
   1,020.72x = 1,409.22 × 648.24
4. Step 4: Simplify right side
   1,020.72x = 913,512.77
5. Step 5: Solve for x
   x = 913,512.77/1,020.72
6. Step 6: Final answer
   x = 894.97