Finding the Fourth Proportional to 20,964.02, 31,451.49 and 7,816.50

Step by Step Solution

1. Step 1: Write the proportion equation
   20,964.02 : 31,451.49 = 7,816.50 : x
2. Step 2: Convert to fraction form
   20,964.02/31,451.49 = 7,816.50/x
3. Step 3: Cross multiply
   20,964.02x = 31,451.49 × 7,816.50
4. Step 4: Simplify right side
   20,964.02x = 245,840,571.59
5. Step 5: Solve for x
   x = 245,840,571.59/20,964.02
6. Step 6: Final answer
   x = 11,726.79