Finding the Fourth Proportional to 2,617.69, 3,612.54 and 1,438.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,617.69 : 3,612.54 = 1,438.78 : x
2. Step 2: Convert to fraction form
   2,617.69/3,612.54 = 1,438.78/x
3. Step 3: Cross multiply
   2,617.69x = 3,612.54 × 1,438.78
4. Step 4: Simplify right side
   2,617.69x = 5,197,650.30
5. Step 5: Solve for x
   x = 5,197,650.30/2,617.69
6. Step 6: Final answer
   x = 1,985.59