Finding the Fourth Proportional to 6,443.72, 9,664.20 and 2,061.56

Step by Step Solution

1. Step 1: Write the proportion equation
   6,443.72 : 9,664.20 = 2,061.56 : x
2. Step 2: Convert to fraction form
   6,443.72/9,664.20 = 2,061.56/x
3. Step 3: Cross multiply
   6,443.72x = 9,664.20 × 2,061.56
4. Step 4: Simplify right side
   6,443.72x = 19,923,328.15
5. Step 5: Solve for x
   x = 19,923,328.15/6,443.72
6. Step 6: Final answer
   x = 3,091.90