Finding the Fourth Proportional to 21,211.36, 31,804.42 and 8,064.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,211.36 : 31,804.42 = 8,064.72 : x
2. Step 2: Convert to fraction form
   21,211.36/31,804.42 = 8,064.72/x
3. Step 3: Cross multiply
   21,211.36x = 31,804.42 × 8,064.72
4. Step 4: Simplify right side
   21,211.36x = 256,493,742.06
5. Step 5: Solve for x
   x = 256,493,742.06/21,211.36
6. Step 6: Final answer
   x = 12,092.28