Finding the Fourth Proportional to 21,311.22, 31,986.54 and 10,788.69

Step by Step Solution

1. Step 1: Write the proportion equation
   21,311.22 : 31,986.54 = 10,788.69 : x
2. Step 2: Convert to fraction form
   21,311.22/31,986.54 = 10,788.69/x
3. Step 3: Cross multiply
   21,311.22x = 31,986.54 × 10,788.69
4. Step 4: Simplify right side
   21,311.22x = 345,092,864.23
5. Step 5: Solve for x
   x = 345,092,864.23/21,311.22
6. Step 6: Final answer
   x = 16,193.01