Finding the Fourth Proportional to 2,577.92, 3,557.50 and 1,398.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,577.92 : 3,557.50 = 1,398.98 : x
2. Step 2: Convert to fraction form
   2,577.92/3,557.50 = 1,398.98/x
3. Step 3: Cross multiply
   2,577.92x = 3,557.50 × 1,398.98
4. Step 4: Simplify right side
   2,577.92x = 4,976,871.35
5. Step 5: Solve for x
   x = 4,976,871.35/2,577.92
6. Step 6: Final answer
   x = 1,930.58