Finding the Fourth Proportional to 2,577.35, 3,556.71 and 1,398.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,577.35 : 3,556.71 = 1,398.39 : x
2. Step 2: Convert to fraction form
   2,577.35/3,556.71 = 1,398.39/x
3. Step 3: Cross multiply
   2,577.35x = 3,556.71 × 1,398.39
4. Step 4: Simplify right side
   2,577.35x = 4,973,667.70
5. Step 5: Solve for x
   x = 4,973,667.70/2,577.35
6. Step 6: Final answer
   x = 1,929.76