Finding the Fourth Proportional to 2,577.74, 3,557.28 and 1,398.82

Step by Step Solution

1. Step 1: Write the proportion equation
   2,577.74 : 3,557.28 = 1,398.82 : x
2. Step 2: Convert to fraction form
   2,577.74/3,557.28 = 1,398.82/x
3. Step 3: Cross multiply
   2,577.74x = 3,557.28 × 1,398.82
4. Step 4: Simplify right side
   2,577.74x = 4,975,994.41
5. Step 5: Solve for x
   x = 4,975,994.41/2,577.74
6. Step 6: Final answer
   x = 1,930.37