Finding the Fourth Proportional to 2,577.11, 3,556.43 and 1,398.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,577.11 : 3,556.43 = 1,398.18 : x
2. Step 2: Convert to fraction form
   2,577.11/3,556.43 = 1,398.18/x
3. Step 3: Cross multiply
   2,577.11x = 3,556.43 × 1,398.18
4. Step 4: Simplify right side
   2,577.11x = 4,972,522.31
5. Step 5: Solve for x
   x = 4,972,522.31/2,577.11
6. Step 6: Final answer
   x = 1,929.50