Finding the Fourth Proportional to 12,155.72, 18,222.80 and 4,765.48

Step by Step Solution

1. Step 1: Write the proportion equation
   12,155.72 : 18,222.80 = 4,765.48 : x
2. Step 2: Convert to fraction form
   12,155.72/18,222.80 = 4,765.48/x
3. Step 3: Cross multiply
   12,155.72x = 18,222.80 × 4,765.48
4. Step 4: Simplify right side
   12,155.72x = 86,840,388.94
5. Step 5: Solve for x
   x = 86,840,388.94/12,155.72
6. Step 6: Final answer
   x = 7,143.99