Finding the Fourth Proportional to 2,572.29, 3,856.98 and 816.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,572.29 : 3,856.98 = 816.96 : x
2. Step 2: Convert to fraction form
   2,572.29/3,856.98 = 816.96/x
3. Step 3: Cross multiply
   2,572.29x = 3,856.98 × 816.96
4. Step 4: Simplify right side
   2,572.29x = 3,150,998.38
5. Step 5: Solve for x
   x = 3,150,998.38/2,572.29
6. Step 6: Final answer
   x = 1,224.98