Finding the Fourth Proportional to 2,617.31, 3,612.14 and 1,438.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,617.31 : 3,612.14 = 1,438.61 : x
2. Step 2: Convert to fraction form
   2,617.31/3,612.14 = 1,438.61/x
3. Step 3: Cross multiply
   2,617.31x = 3,612.14 × 1,438.61
4. Step 4: Simplify right side
   2,617.31x = 5,196,469.28
5. Step 5: Solve for x
   x = 5,196,469.28/2,617.31
6. Step 6: Final answer
   x = 1,985.42