Finding the Fourth Proportional to 1,767.88, 2,439.89 and 1,208.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,767.88 : 2,439.89 = 1,208.17 : x
2. Step 2: Convert to fraction form
   1,767.88/2,439.89 = 1,208.17/x
3. Step 3: Cross multiply
   1,767.88x = 2,439.89 × 1,208.17
4. Step 4: Simplify right side
   1,767.88x = 2,947,801.90
5. Step 5: Solve for x
   x = 2,947,801.90/1,767.88
6. Step 6: Final answer
   x = 1,667.42