Finding the Fourth Proportional to 2,812.72, 4,216.38 and 2,572.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,812.72 : 4,216.38 = 2,572.12 : x
2. Step 2: Convert to fraction form
   2,812.72/4,216.38 = 2,572.12/x
3. Step 3: Cross multiply
   2,812.72x = 4,216.38 × 2,572.12
4. Step 4: Simplify right side
   2,812.72x = 10,845,035.33
5. Step 5: Solve for x
   x = 10,845,035.33/2,812.72
6. Step 6: Final answer
   x = 3,855.71