Finding the Fourth Proportional to 2,577.81, 3,557.37 and 1,398.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,577.81 : 3,557.37 = 1,398.86 : x
2. Step 2: Convert to fraction form
   2,577.81/3,557.37 = 1,398.86/x
3. Step 3: Cross multiply
   2,577.81x = 3,557.37 × 1,398.86
4. Step 4: Simplify right side
   2,577.81x = 4,976,255.53
5. Step 5: Solve for x
   x = 4,976,255.53/2,577.81
6. Step 6: Final answer
   x = 1,930.42