Finding the Fourth Proportional to 12,310.73, 18,466.34 and 3,990.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,310.73 : 18,466.34 = 3,990.72 : x
2. Step 2: Convert to fraction form
   12,310.73/18,466.34 = 3,990.72/x
3. Step 3: Cross multiply
   12,310.73x = 18,466.34 × 3,990.72
4. Step 4: Simplify right side
   12,310.73x = 73,693,972.41
5. Step 5: Solve for x
   x = 73,693,972.41/12,310.73
6. Step 6: Final answer
   x = 5,986.16