Finding the Fourth Proportional to 2,577.78, 3,557.29 and 1,398.84

Step by Step Solution

1. Step 1: Write the proportion equation
   2,577.78 : 3,557.29 = 1,398.84 : x
2. Step 2: Convert to fraction form
   2,577.78/3,557.29 = 1,398.84/x
3. Step 3: Cross multiply
   2,577.78x = 3,557.29 × 1,398.84
4. Step 4: Simplify right side
   2,577.78x = 4,976,079.54
5. Step 5: Solve for x
   x = 4,976,079.54/2,577.78
6. Step 6: Final answer
   x = 1,930.37