Finding the Fourth Proportional to 2,577.99, 3,557.60 and 1,399.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,577.99 : 3,557.60 = 1,399.06 : x
2. Step 2: Convert to fraction form
   2,577.99/3,557.60 = 1,399.06/x
3. Step 3: Cross multiply
   2,577.99x = 3,557.60 × 1,399.06
4. Step 4: Simplify right side
   2,577.99x = 4,977,298.55
5. Step 5: Solve for x
   x = 4,977,298.55/2,577.99
6. Step 6: Final answer
   x = 1,930.69