Finding the Fourth Proportional to 12,245.67, 18,356.82 and 3,920.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,245.67 : 18,356.82 = 3,920.31 : x
2. Step 2: Convert to fraction form
   12,245.67/18,356.82 = 3,920.31/x
3. Step 3: Cross multiply
   12,245.67x = 18,356.82 × 3,920.31
4. Step 4: Simplify right side
   12,245.67x = 71,964,425.01
5. Step 5: Solve for x
   x = 71,964,425.01/12,245.67
6. Step 6: Final answer
   x = 5,876.72