Finding the Fourth Proportional to 2,577.15, 3,556.46 and 1,398.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,577.15 : 3,556.46 = 1,398.21 : x
2. Step 2: Convert to fraction form
   2,577.15/3,556.46 = 1,398.21/x
3. Step 3: Cross multiply
   2,577.15x = 3,556.46 × 1,398.21
4. Step 4: Simplify right side
   2,577.15x = 4,972,670.95
5. Step 5: Solve for x
   x = 4,972,670.95/2,577.15
6. Step 6: Final answer
   x = 1,929.52