Finding the Fourth Proportional to 2,663.92, 3,996.04 and 1,020.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,663.92 : 3,996.04 = 1,020.72 : x
2. Step 2: Convert to fraction form
   2,663.92/3,996.04 = 1,020.72/x
3. Step 3: Cross multiply
   2,663.92x = 3,996.04 × 1,020.72
4. Step 4: Simplify right side
   2,663.92x = 4,078,837.95
5. Step 5: Solve for x
   x = 4,078,837.95/2,663.92
6. Step 6: Final answer
   x = 1,531.14