Finding the Fourth Proportional to 21,213.32, 31,789.89 and 15,622.82

Step by Step Solution

1. Step 1: Write the proportion equation
   21,213.32 : 31,789.89 = 15,622.82 : x
2. Step 2: Convert to fraction form
   21,213.32/31,789.89 = 15,622.82/x
3. Step 3: Cross multiply
   21,213.32x = 31,789.89 × 15,622.82
4. Step 4: Simplify right side
   21,213.32x = 496,647,729.29
5. Step 5: Solve for x
   x = 496,647,729.29/21,213.32
6. Step 6: Final answer
   x = 23,412.07