Finding the Fourth Proportional to 3,700.40, 5,105.34 and 2,638.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,700.40 : 5,105.34 = 2,638.31 : x
2. Step 2: Convert to fraction form
   3,700.40/5,105.34 = 2,638.31/x
3. Step 3: Cross multiply
   3,700.40x = 5,105.34 × 2,638.31
4. Step 4: Simplify right side
   3,700.40x = 13,469,444.05
5. Step 5: Solve for x
   x = 13,469,444.05/3,700.40
6. Step 6: Final answer
   x = 3,640.00