Finding the Fourth Proportional to 2,908.50, 4,363.59 and 856.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,908.50 : 4,363.59 = 856.50 : x
2. Step 2: Convert to fraction form
   2,908.50/4,363.59 = 856.50/x
3. Step 3: Cross multiply
   2,908.50x = 4,363.59 × 856.50
4. Step 4: Simplify right side
   2,908.50x = 3,737,414.84
5. Step 5: Solve for x
   x = 3,737,414.84/2,908.50
6. Step 6: Final answer
   x = 1,285.00