Finding the Fourth Proportional to 3,780.72, 5,207.62 and 2,644.38

Step by Step Solution

1. Step 1: Write the proportion equation
   3,780.72 : 5,207.62 = 2,644.38 : x
2. Step 2: Convert to fraction form
   3,780.72/5,207.62 = 2,644.38/x
3. Step 3: Cross multiply
   3,780.72x = 5,207.62 × 2,644.38
4. Step 4: Simplify right side
   3,780.72x = 13,770,919.56
5. Step 5: Solve for x
   x = 13,770,919.56/3,780.72
6. Step 6: Final answer
   x = 3,642.41