Finding the Fourth Proportional to 2,577.76, 3,557.32 and 1,398.83

Step by Step Solution

1. Step 1: Write the proportion equation
   2,577.76 : 3,557.32 = 1,398.83 : x
2. Step 2: Convert to fraction form
   2,577.76/3,557.32 = 1,398.83/x
3. Step 3: Cross multiply
   2,577.76x = 3,557.32 × 1,398.83
4. Step 4: Simplify right side
   2,577.76x = 4,976,083.31
5. Step 5: Solve for x
   x = 4,976,083.31/2,577.76
6. Step 6: Final answer
   x = 1,930.39