Finding the Fourth Proportional to 2,439.06, 3,657.53 and 772.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,439.06 : 3,657.53 = 772.78 : x
2. Step 2: Convert to fraction form
   2,439.06/3,657.53 = 772.78/x
3. Step 3: Cross multiply
   2,439.06x = 3,657.53 × 772.78
4. Step 4: Simplify right side
   2,439.06x = 2,826,443.88
5. Step 5: Solve for x
   x = 2,826,443.88/2,439.06
6. Step 6: Final answer
   x = 1,158.83