Finding the Fourth Proportional to 2,617.75, 3,612.50 and 1,438.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,617.75 : 3,612.50 = 1,438.80 : x
2. Step 2: Convert to fraction form
   2,617.75/3,612.50 = 1,438.80/x
3. Step 3: Cross multiply
   2,617.75x = 3,612.50 × 1,438.80
4. Step 4: Simplify right side
   2,617.75x = 5,197,665
5. Step 5: Solve for x
   x = 5,197,665/2,617.75
6. Step 6: Final answer
   x = 1,985.55