Finding the Fourth Proportional to 2,617.89, 3,612.69 and 1,438.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,617.89 : 3,612.69 = 1,438.98 : x
2. Step 2: Convert to fraction form
   2,617.89/3,612.69 = 1,438.98/x
3. Step 3: Cross multiply
   2,617.89x = 3,612.69 × 1,438.98
4. Step 4: Simplify right side
   2,617.89x = 5,198,588.66
5. Step 5: Solve for x
   x = 5,198,588.66/2,617.89
6. Step 6: Final answer
   x = 1,985.79