Finding the Fourth Proportional to 21,272.33, 31,892.83 and 7,228.57

Step by Step Solution

1. Step 1: Write the proportion equation
   21,272.33 : 31,892.83 = 7,228.57 : x
2. Step 2: Convert to fraction form
   21,272.33/31,892.83 = 7,228.57/x
3. Step 3: Cross multiply
   21,272.33x = 31,892.83 × 7,228.57
4. Step 4: Simplify right side
   21,272.33x = 230,539,358.55
5. Step 5: Solve for x
   x = 230,539,358.55/21,272.33
6. Step 6: Final answer
   x = 10,837.53