Finding the Fourth Proportional to 2,577.71, 3,557.25 and 1,398.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,577.71 : 3,557.25 = 1,398.79 : x
2. Step 2: Convert to fraction form
   2,577.71/3,557.25 = 1,398.79/x
3. Step 3: Cross multiply
   2,577.71x = 3,557.25 × 1,398.79
4. Step 4: Simplify right side
   2,577.71x = 4,975,820.95
5. Step 5: Solve for x
   x = 4,975,820.95/2,577.71
6. Step 6: Final answer
   x = 1,930.33