Finding the Fourth Proportional to 2,577.38, 3,556.74 and 1,398.49

Step by Step Solution

1. Step 1: Write the proportion equation
   2,577.38 : 3,556.74 = 1,398.49 : x
2. Step 2: Convert to fraction form
   2,577.38/3,556.74 = 1,398.49/x
3. Step 3: Cross multiply
   2,577.38x = 3,556.74 × 1,398.49
4. Step 4: Simplify right side
   2,577.38x = 4,974,061.68
5. Step 5: Solve for x
   x = 4,974,061.68/2,577.38
6. Step 6: Final answer
   x = 1,929.89