Finding the Fourth Proportional to 2,557.83, 3,529.99 and 1,438.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,557.83 : 3,529.99 = 1,438.88 : x
2. Step 2: Convert to fraction form
   2,557.83/3,529.99 = 1,438.88/x
3. Step 3: Cross multiply
   2,557.83x = 3,529.99 × 1,438.88
4. Step 4: Simplify right side
   2,557.83x = 5,079,219.59
5. Step 5: Solve for x
   x = 5,079,219.59/2,557.83
6. Step 6: Final answer
   x = 1,985.75