Finding the Fourth Proportional to 2,817.82, 3,888.83 and 1,638.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,817.82 : 3,888.83 = 1,638.81 : x
2. Step 2: Convert to fraction form
   2,817.82/3,888.83 = 1,638.81/x
3. Step 3: Cross multiply
   2,817.82x = 3,888.83 × 1,638.81
4. Step 4: Simplify right side
   2,817.82x = 6,373,053.49
5. Step 5: Solve for x
   x = 6,373,053.49/2,817.82
6. Step 6: Final answer
   x = 2,261.70