Finding the Fourth Proportional to 2,638.10, 3,636.69 and 1,938.26

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638.10 : 3,636.69 = 1,938.26 : x
2. Step 2: Convert to fraction form
   2,638.10/3,636.69 = 1,938.26/x
3. Step 3: Cross multiply
   2,638.10x = 3,636.69 × 1,938.26
4. Step 4: Simplify right side
   2,638.10x = 7,048,850.76
5. Step 5: Solve for x
   x = 7,048,850.76/2,638.10
6. Step 6: Final answer
   x = 2,671.94