Finding the Fourth Proportional to 5,111.52, 7,663.38 and 2,644.78

Step by Step Solution

1. Step 1: Write the proportion equation
   5,111.52 : 7,663.38 = 2,644.78 : x
2. Step 2: Convert to fraction form
   5,111.52/7,663.38 = 2,644.78/x
3. Step 3: Cross multiply
   5,111.52x = 7,663.38 × 2,644.78
4. Step 4: Simplify right side
   5,111.52x = 20,267,954.16
5. Step 5: Solve for x
   x = 20,267,954.16/5,111.52
6. Step 6: Final answer
   x = 3,965.15