Finding the Fourth Proportional to 20,424.39, 30,621.55 and 7,772.37

Step by Step Solution

1. Step 1: Write the proportion equation
   20,424.39 : 30,621.55 = 7,772.37 : x
2. Step 2: Convert to fraction form
   20,424.39/30,621.55 = 7,772.37/x
3. Step 3: Cross multiply
   20,424.39x = 30,621.55 × 7,772.37
4. Step 4: Simplify right side
   20,424.39x = 238,002,016.57
5. Step 5: Solve for x
   x = 238,002,016.57/20,424.39
6. Step 6: Final answer
   x = 11,652.83