Finding the Fourth Proportional to 21,222.56, 31,838.82 and 20,869.94

Step by Step Solution

1. Step 1: Write the proportion equation
   21,222.56 : 31,838.82 = 20,869.94 : x
2. Step 2: Convert to fraction form
   21,222.56/31,838.82 = 20,869.94/x
3. Step 3: Cross multiply
   21,222.56x = 31,838.82 × 20,869.94
4. Step 4: Simplify right side
   21,222.56x = 664,474,263.07
5. Step 5: Solve for x
   x = 664,474,263.07/21,222.56
6. Step 6: Final answer
   x = 31,309.81