Finding the Fourth Proportional to 2,577.47, 3,556.91 and 1,398.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,577.47 : 3,556.91 = 1,398.56 : x
2. Step 2: Convert to fraction form
   2,577.47/3,556.91 = 1,398.56/x
3. Step 3: Cross multiply
   2,577.47x = 3,556.91 × 1,398.56
4. Step 4: Simplify right side
   2,577.47x = 4,974,527.27
5. Step 5: Solve for x
   x = 4,974,527.27/2,577.47
6. Step 6: Final answer
   x = 1,930.01