Finding the Fourth Proportional to 3,690.32, 5,087.22 and 2,640.56

Step by Step Solution

1. Step 1: Write the proportion equation
   3,690.32 : 5,087.22 = 2,640.56 : x
2. Step 2: Convert to fraction form
   3,690.32/5,087.22 = 2,640.56/x
3. Step 3: Cross multiply
   3,690.32x = 5,087.22 × 2,640.56
4. Step 4: Simplify right side
   3,690.32x = 13,433,109.64
5. Step 5: Solve for x
   x = 13,433,109.64/3,690.32
6. Step 6: Final answer
   x = 3,640.09