Finding the Fourth Proportional to 2,577.94, 3,557.55 and 1,399.01

Step by Step Solution

1. Step 1: Write the proportion equation
   2,577.94 : 3,557.55 = 1,399.01 : x
2. Step 2: Convert to fraction form
   2,577.94/3,557.55 = 1,399.01/x
3. Step 3: Cross multiply
   2,577.94x = 3,557.55 × 1,399.01
4. Step 4: Simplify right side
   2,577.94x = 4,977,035.48
5. Step 5: Solve for x
   x = 4,977,035.48/2,577.94
6. Step 6: Final answer
   x = 1,930.63