Finding the Fourth Proportional to 2,107.89, 2,908.35 and 1,361.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,107.89 : 2,908.35 = 1,361.61 : x
2. Step 2: Convert to fraction form
   2,107.89/2,908.35 = 1,361.61/x
3. Step 3: Cross multiply
   2,107.89x = 2,908.35 × 1,361.61
4. Step 4: Simplify right side
   2,107.89x = 3,960,038.44
5. Step 5: Solve for x
   x = 3,960,038.44/2,107.89
6. Step 6: Final answer
   x = 1,878.67