Finding the Fourth Proportional to 2,617.61, 3,612.17 and 1,438.46

Step by Step Solution

1. Step 1: Write the proportion equation
   2,617.61 : 3,612.17 = 1,438.46 : x
2. Step 2: Convert to fraction form
   2,617.61/3,612.17 = 1,438.46/x
3. Step 3: Cross multiply
   2,617.61x = 3,612.17 × 1,438.46
4. Step 4: Simplify right side
   2,617.61x = 5,195,936.81
5. Step 5: Solve for x
   x = 5,195,936.81/2,617.61
6. Step 6: Final answer
   x = 1,985.00