Finding the Fourth Proportional to 2,572.31, 3,858.84 and 816.73

Step by Step Solution

1. Step 1: Write the proportion equation
   2,572.31 : 3,858.84 = 816.73 : x
2. Step 2: Convert to fraction form
   2,572.31/3,858.84 = 816.73/x
3. Step 3: Cross multiply
   2,572.31x = 3,858.84 × 816.73
4. Step 4: Simplify right side
   2,572.31x = 3,151,630.39
5. Step 5: Solve for x
   x = 3,151,630.39/2,572.31
6. Step 6: Final answer
   x = 1,225.21