Finding the Fourth Proportional to 2,617.63, 3,612.33 and 1,438.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,617.63 : 3,612.33 = 1,438.78 : x
2. Step 2: Convert to fraction form
   2,617.63/3,612.33 = 1,438.78/x
3. Step 3: Cross multiply
   2,617.63x = 3,612.33 × 1,438.78
4. Step 4: Simplify right side
   2,617.63x = 5,197,348.16
5. Step 5: Solve for x
   x = 5,197,348.16/2,617.63
6. Step 6: Final answer
   x = 1,985.52