Finding the Fourth Proportional to 7,221.73, 9,965.55 and 4,238.10

Step by Step Solution

1. Step 1: Write the proportion equation
   7,221.73 : 9,965.55 = 4,238.10 : x
2. Step 2: Convert to fraction form
   7,221.73/9,965.55 = 4,238.10/x
3. Step 3: Cross multiply
   7,221.73x = 9,965.55 × 4,238.10
4. Step 4: Simplify right side
   7,221.73x = 42,234,997.46
5. Step 5: Solve for x
   x = 42,234,997.46/7,221.73
6. Step 6: Final answer
   x = 5,848.32