Finding the Fourth Proportional to 12,231.89, 18,342.48 and 4,331.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,231.89 : 18,342.48 = 4,331.78 : x
2. Step 2: Convert to fraction form
   12,231.89/18,342.48 = 4,331.78/x
3. Step 3: Cross multiply
   12,231.89x = 18,342.48 × 4,331.78
4. Step 4: Simplify right side
   12,231.89x = 79,455,581.33
5. Step 5: Solve for x
   x = 79,455,581.33/12,231.89
6. Step 6: Final answer
   x = 6,495.77