Finding the Fourth Proportional to 2,563.31, 3,845.34 and 807.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,563.31 : 3,845.34 = 807.72 : x
2. Step 2: Convert to fraction form
   2,563.31/3,845.34 = 807.72/x
3. Step 3: Cross multiply
   2,563.31x = 3,845.34 × 807.72
4. Step 4: Simplify right side
   2,563.31x = 3,105,965.23
5. Step 5: Solve for x
   x = 3,105,965.23/2,563.31
6. Step 6: Final answer
   x = 1,211.70