Finding the Fourth Proportional to 21,912.82, 32,874.42 and 7,121.74

Step by Step Solution

1. Step 1: Write the proportion equation
   21,912.82 : 32,874.42 = 7,121.74 : x
2. Step 2: Convert to fraction form
   21,912.82/32,874.42 = 7,121.74/x
3. Step 3: Cross multiply
   21,912.82x = 32,874.42 × 7,121.74
4. Step 4: Simplify right side
   21,912.82x = 234,123,071.89
5. Step 5: Solve for x
   x = 234,123,071.89/21,912.82
6. Step 6: Final answer
   x = 10,684.30