Finding the Fourth Proportional to 2,557.00, 3,528.36 and 1,438.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,557.00 : 3,528.36 = 1,438.05 : x
2. Step 2: Convert to fraction form
   2,557.00/3,528.36 = 1,438.05/x
3. Step 3: Cross multiply
   2,557.00x = 3,528.36 × 1,438.05
4. Step 4: Simplify right side
   2,557.00x = 5,073,971.33
5. Step 5: Solve for x
   x = 5,073,971.33/2,557.00
6. Step 6: Final answer
   x = 1,984.34