Finding the Fourth Proportional to 2,577.86, 3,557.42 and 1,398.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,577.86 : 3,557.42 = 1,398.92 : x
2. Step 2: Convert to fraction form
   2,577.86/3,557.42 = 1,398.92/x
3. Step 3: Cross multiply
   2,577.86x = 3,557.42 × 1,398.92
4. Step 4: Simplify right side
   2,577.86x = 4,976,521.20
5. Step 5: Solve for x
   x = 4,976,521.20/2,577.86
6. Step 6: Final answer
   x = 1,930.49