Finding the Fourth Proportional to 21,451.71, 29,603.34 and 12,020.34

Step by Step Solution

1. Step 1: Write the proportion equation
   21,451.71 : 29,603.34 = 12,020.34 : x
2. Step 2: Convert to fraction form
   21,451.71/29,603.34 = 12,020.34/x
3. Step 3: Cross multiply
   21,451.71x = 29,603.34 × 12,020.34
4. Step 4: Simplify right side
   21,451.71x = 355,842,211.94
5. Step 5: Solve for x
   x = 355,842,211.94/21,451.71
6. Step 6: Final answer
   x = 16,588.06