Finding the Fourth Proportional to 21,308.36, 31,944.06 and 8,151.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,308.36 : 31,944.06 = 8,151.50 : x
2. Step 2: Convert to fraction form
   21,308.36/31,944.06 = 8,151.50/x
3. Step 3: Cross multiply
   21,308.36x = 31,944.06 × 8,151.50
4. Step 4: Simplify right side
   21,308.36x = 260,391,845.37
5. Step 5: Solve for x
   x = 260,391,845.37/21,308.36
6. Step 6: Final answer
   x = 12,220.18