Finding the Fourth Proportional to 2,557.53, 3,529.16 and 1,438.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,557.53 : 3,529.16 = 1,438.57 : x
2. Step 2: Convert to fraction form
   2,557.53/3,529.16 = 1,438.57/x
3. Step 3: Cross multiply
   2,557.53x = 3,529.16 × 1,438.57
4. Step 4: Simplify right side
   2,557.53x = 5,076,927.69
5. Step 5: Solve for x
   x = 5,076,927.69/2,557.53
6. Step 6: Final answer
   x = 1,985.09