Finding the Fourth Proportional to 2,663.66, 3,997.12 and 1,020.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,663.66 : 3,997.12 = 1,020.38 : x
2. Step 2: Convert to fraction form
   2,663.66/3,997.12 = 1,020.38/x
3. Step 3: Cross multiply
   2,663.66x = 3,997.12 × 1,020.38
4. Step 4: Simplify right side
   2,663.66x = 4,078,581.31
5. Step 5: Solve for x
   x = 4,078,581.31/2,663.66
6. Step 6: Final answer
   x = 1,531.19