Finding the Fourth Proportional to 21,272.14, 31,902.34 and 11,263.31

Step by Step Solution

1. Step 1: Write the proportion equation
   21,272.14 : 31,902.34 = 11,263.31 : x
2. Step 2: Convert to fraction form
   21,272.14/31,902.34 = 11,263.31/x
3. Step 3: Cross multiply
   21,272.14x = 31,902.34 × 11,263.31
4. Step 4: Simplify right side
   21,272.14x = 359,325,945.15
5. Step 5: Solve for x
   x = 359,325,945.15/21,272.14
6. Step 6: Final answer
   x = 16,891.86