Finding the Fourth Proportional to 2,859.50, 4,288.34 and 911.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,859.50 : 4,288.34 = 911.25 : x
2. Step 2: Convert to fraction form
   2,859.50/4,288.34 = 911.25/x
3. Step 3: Cross multiply
   2,859.50x = 4,288.34 × 911.25
4. Step 4: Simplify right side
   2,859.50x = 3,907,752.10
5. Step 5: Solve for x
   x = 3,907,752.10/2,859.50
6. Step 6: Final answer
   x = 1,366.58