Finding the Fourth Proportional to 2,617.68, 3,612.47 and 1,438.83

Step by Step Solution

1. Step 1: Write the proportion equation
   2,617.68 : 3,612.47 = 1,438.83 : x
2. Step 2: Convert to fraction form
   2,617.68/3,612.47 = 1,438.83/x
3. Step 3: Cross multiply
   2,617.68x = 3,612.47 × 1,438.83
4. Step 4: Simplify right side
   2,617.68x = 5,197,712.15
5. Step 5: Solve for x
   x = 5,197,712.15/2,617.68
6. Step 6: Final answer
   x = 1,985.62