Finding the Fourth Proportional to 21,073.20, 29,081.86 and 12,120.70

Step by Step Solution

1. Step 1: Write the proportion equation
   21,073.20 : 29,081.86 = 12,120.70 : x
2. Step 2: Convert to fraction form
   21,073.20/29,081.86 = 12,120.70/x
3. Step 3: Cross multiply
   21,073.20x = 29,081.86 × 12,120.70
4. Step 4: Simplify right side
   21,073.20x = 352,492,500.50
5. Step 5: Solve for x
   x = 352,492,500.50/21,073.20
6. Step 6: Final answer
   x = 16,727.05