Finding the Fourth Proportional to 20,772.27, 31,139.88 and 7,621.59

Step by Step Solution

1. Step 1: Write the proportion equation
   20,772.27 : 31,139.88 = 7,621.59 : x
2. Step 2: Convert to fraction form
   20,772.27/31,139.88 = 7,621.59/x
3. Step 3: Cross multiply
   20,772.27x = 31,139.88 × 7,621.59
4. Step 4: Simplify right side
   20,772.27x = 237,335,398.01
5. Step 5: Solve for x
   x = 237,335,398.01/20,772.27
6. Step 6: Final answer
   x = 11,425.59