Finding the Fourth Proportional to 2,817.27, 3,887.96 and 1,638.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,817.27 : 3,887.96 = 1,638.72 : x
2. Step 2: Convert to fraction form
   2,817.27/3,887.96 = 1,638.72/x
3. Step 3: Cross multiply
   2,817.27x = 3,887.96 × 1,638.72
4. Step 4: Simplify right side
   2,817.27x = 6,371,269.62
5. Step 5: Solve for x
   x = 6,371,269.62/2,817.27
6. Step 6: Final answer
   x = 2,261.50