Finding the Fourth Proportional to 6,321.72, 8,721.72 and 3,667.68

Step by Step Solution

1. Step 1: Write the proportion equation
   6,321.72 : 8,721.72 = 3,667.68 : x
2. Step 2: Convert to fraction form
   6,321.72/8,721.72 = 3,667.68/x
3. Step 3: Cross multiply
   6,321.72x = 8,721.72 × 3,667.68
4. Step 4: Simplify right side
   6,321.72x = 31,988,478.01
5. Step 5: Solve for x
   x = 31,988,478.01/6,321.72
6. Step 6: Final answer
   x = 5,060.09