Finding the Fourth Proportional to 7,221.87, 9,960.71 and 5,238.99

Step by Step Solution

1. Step 1: Write the proportion equation
   7,221.87 : 9,960.71 = 5,238.99 : x
2. Step 2: Convert to fraction form
   7,221.87/9,960.71 = 5,238.99/x
3. Step 3: Cross multiply
   7,221.87x = 9,960.71 × 5,238.99
4. Step 4: Simplify right side
   7,221.87x = 52,184,033.89
5. Step 5: Solve for x
   x = 52,184,033.89/7,221.87
6. Step 6: Final answer
   x = 7,225.83