Finding the Fourth Proportional to 21,311.12, 31,959.76 and 10,064.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,311.12 : 31,959.76 = 10,064.72 : x
2. Step 2: Convert to fraction form
   21,311.12/31,959.76 = 10,064.72/x
3. Step 3: Cross multiply
   21,311.12x = 31,959.76 × 10,064.72
4. Step 4: Simplify right side
   21,311.12x = 321,666,035.67
5. Step 5: Solve for x
   x = 321,666,035.67/21,311.12
6. Step 6: Final answer
   x = 15,093.81