Finding the Fourth Proportional to 2,577.40, 3,556.82 and 1,398.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,577.40 : 3,556.82 = 1,398.48 : x
2. Step 2: Convert to fraction form
   2,577.40/3,556.82 = 1,398.48/x
3. Step 3: Cross multiply
   2,577.40x = 3,556.82 × 1,398.48
4. Step 4: Simplify right side
   2,577.40x = 4,974,141.63
5. Step 5: Solve for x
   x = 4,974,141.63/2,577.40
6. Step 6: Final answer
   x = 1,929.91