Finding the Fourth Proportional to 1,544.78, 2,315.55 and 722.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,544.78 : 2,315.55 = 722.39 : x
2. Step 2: Convert to fraction form
   1,544.78/2,315.55 = 722.39/x
3. Step 3: Cross multiply
   1,544.78x = 2,315.55 × 722.39
4. Step 4: Simplify right side
   1,544.78x = 1,672,721.30
5. Step 5: Solve for x
   x = 1,672,721.30/1,544.78
6. Step 6: Final answer
   x = 1,082.82