Finding the Fourth Proportional to 21,168.08, 31,729.90 and 7,123.23

Step by Step Solution

1. Step 1: Write the proportion equation
   21,168.08 : 31,729.90 = 7,123.23 : x
2. Step 2: Convert to fraction form
   21,168.08/31,729.90 = 7,123.23/x
3. Step 3: Cross multiply
   21,168.08x = 31,729.90 × 7,123.23
4. Step 4: Simplify right side
   21,168.08x = 226,019,375.58
5. Step 5: Solve for x
   x = 226,019,375.58/21,168.08
6. Step 6: Final answer
   x = 10,677.37