Finding the Fourth Proportional to 21,272.72, 31,906.62 and 5,691.56

Step by Step Solution

1. Step 1: Write the proportion equation
   21,272.72 : 31,906.62 = 5,691.56 : x
2. Step 2: Convert to fraction form
   21,272.72/31,906.62 = 5,691.56/x
3. Step 3: Cross multiply
   21,272.72x = 31,906.62 × 5,691.56
4. Step 4: Simplify right side
   21,272.72x = 181,598,282.59
5. Step 5: Solve for x
   x = 181,598,282.59/21,272.72
6. Step 6: Final answer
   x = 8,536.68