Finding the Fourth Proportional to 2,577.50, 3,556.96 and 1,398.58

Step by Step Solution

1. Step 1: Write the proportion equation
   2,577.50 : 3,556.96 = 1,398.58 : x
2. Step 2: Convert to fraction form
   2,577.50/3,556.96 = 1,398.58/x
3. Step 3: Cross multiply
   2,577.50x = 3,556.96 × 1,398.58
4. Step 4: Simplify right side
   2,577.50x = 4,974,688.59
5. Step 5: Solve for x
   x = 4,974,688.59/2,577.50
6. Step 6: Final answer
   x = 1,930.05