Finding the Fourth Proportional to 20,309.67, 30,456.43 and 7,822.80

Step by Step Solution

1. Step 1: Write the proportion equation
   20,309.67 : 30,456.43 = 7,822.80 : x
2. Step 2: Convert to fraction form
   20,309.67/30,456.43 = 7,822.80/x
3. Step 3: Cross multiply
   20,309.67x = 30,456.43 × 7,822.80
4. Step 4: Simplify right side
   20,309.67x = 238,254,541.05
5. Step 5: Solve for x
   x = 238,254,541.05/20,309.67
6. Step 6: Final answer
   x = 11,731.09