Finding the Fourth Proportional to 2,856.72, 4,284.16 and 908.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,856.72 : 4,284.16 = 908.47 : x
2. Step 2: Convert to fraction form
   2,856.72/4,284.16 = 908.47/x
3. Step 3: Cross multiply
   2,856.72x = 4,284.16 × 908.47
4. Step 4: Simplify right side
   2,856.72x = 3,892,004.87
5. Step 5: Solve for x
   x = 3,892,004.87/2,856.72
6. Step 6: Final answer
   x = 1,362.40