Finding the Fourth Proportional to 2,577.06, 3,556.35 and 1,398.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,577.06 : 3,556.35 = 1,398.15 : x
2. Step 2: Convert to fraction form
   2,577.06/3,556.35 = 1,398.15/x
3. Step 3: Cross multiply
   2,577.06x = 3,556.35 × 1,398.15
4. Step 4: Simplify right side
   2,577.06x = 4,972,310.75
5. Step 5: Solve for x
   x = 4,972,310.75/2,577.06
6. Step 6: Final answer
   x = 1,929.45