Finding the Fourth Proportional to 2,663.13, 3,992.22 and 1,275.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,663.13 : 3,992.22 = 1,275.78 : x
2. Step 2: Convert to fraction form
   2,663.13/3,992.22 = 1,275.78/x
3. Step 3: Cross multiply
   2,663.13x = 3,992.22 × 1,275.78
4. Step 4: Simplify right side
   2,663.13x = 5,093,194.43
5. Step 5: Solve for x
   x = 5,093,194.43/2,663.13
6. Step 6: Final answer
   x = 1,912.48