Finding the Fourth Proportional to 21,911.71, 30,244.35 and 12,962.32

Step by Step Solution

1. Step 1: Write the proportion equation
   21,911.71 : 30,244.35 = 12,962.32 : x
2. Step 2: Convert to fraction form
   21,911.71/30,244.35 = 12,962.32/x
3. Step 3: Cross multiply
   21,911.71x = 30,244.35 × 12,962.32
4. Step 4: Simplify right side
   21,911.71x = 392,036,942.89
5. Step 5: Solve for x
   x = 392,036,942.89/21,911.71
6. Step 6: Final answer
   x = 17,891.66