Finding the Fourth Proportional to 2,517.76, 3,474.51 and 1,398.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,517.76 : 3,474.51 = 1,398.78 : x
2. Step 2: Convert to fraction form
   2,517.76/3,474.51 = 1,398.78/x
3. Step 3: Cross multiply
   2,517.76x = 3,474.51 × 1,398.78
4. Step 4: Simplify right side
   2,517.76x = 4,860,057.73
5. Step 5: Solve for x
   x = 4,860,057.73/2,517.76
6. Step 6: Final answer
   x = 1,930.31