Finding the Fourth Proportional to 9,222.05, 12,727.81 and 5,639.06

Step by Step Solution

1. Step 1: Write the proportion equation
   9,222.05 : 12,727.81 = 5,639.06 : x
2. Step 2: Convert to fraction form
   9,222.05/12,727.81 = 5,639.06/x
3. Step 3: Cross multiply
   9,222.05x = 12,727.81 × 5,639.06
4. Step 4: Simplify right side
   9,222.05x = 71,772,901.98
5. Step 5: Solve for x
   x = 71,772,901.98/9,222.05
6. Step 6: Final answer
   x = 7,782.75