Finding the Fourth Proportional to 21,314.16, 31,990.94 and 10,791.57

Step by Step Solution

1. Step 1: Write the proportion equation
   21,314.16 : 31,990.94 = 10,791.57 : x
2. Step 2: Convert to fraction form
   21,314.16/31,990.94 = 10,791.57/x
3. Step 3: Cross multiply
   21,314.16x = 31,990.94 × 10,791.57
4. Step 4: Simplify right side
   21,314.16x = 345,232,414.42
5. Step 5: Solve for x
   x = 345,232,414.42/21,314.16
6. Step 6: Final answer
   x = 16,197.33