Finding the Fourth Proportional to 2,557.46, 3,529.40 and 1,438.45

Step by Step Solution

1. Step 1: Write the proportion equation
   2,557.46 : 3,529.40 = 1,438.45 : x
2. Step 2: Convert to fraction form
   2,557.46/3,529.40 = 1,438.45/x
3. Step 3: Cross multiply
   2,557.46x = 3,529.40 × 1,438.45
4. Step 4: Simplify right side
   2,557.46x = 5,076,865.43
5. Step 5: Solve for x
   x = 5,076,865.43/2,557.46
6. Step 6: Final answer
   x = 1,985.12