Finding the Fourth Proportional to 21,333.84, 31,938.80 and 12,422.00

Step by Step Solution

1. Step 1: Write the proportion equation
   21,333.84 : 31,938.80 = 12,422.00 : x
2. Step 2: Convert to fraction form
   21,333.84/31,938.80 = 12,422.00/x
3. Step 3: Cross multiply
   21,333.84x = 31,938.80 × 12,422.00
4. Step 4: Simplify right side
   21,333.84x = 396,743,551.80
5. Step 5: Solve for x
   x = 396,743,551.80/21,333.84
6. Step 6: Final answer
   x = 18,596.91