Finding the Fourth Proportional to 2,577.21, 3,556.55 and 1,398.27

Step by Step Solution

1. Step 1: Write the proportion equation
   2,577.21 : 3,556.55 = 1,398.27 : x
2. Step 2: Convert to fraction form
   2,577.21/3,556.55 = 1,398.27/x
3. Step 3: Cross multiply
   2,577.21x = 3,556.55 × 1,398.27
4. Step 4: Simplify right side
   2,577.21x = 4,973,010.18
5. Step 5: Solve for x
   x = 4,973,010.18/2,577.21
6. Step 6: Final answer
   x = 1,929.61