Finding the Fourth Proportional to 22,080.48, 33,120.72 and 12,840

Step by Step Solution

1. Step 1: Write the proportion equation
   22,080.48 : 33,120.72 = 12,840 : x
2. Step 2: Convert to fraction form
   22,080.48/33,120.72 = 12,840/x
3. Step 3: Cross multiply
   22,080.48x = 33,120.72 × 12,840
4. Step 4: Simplify right side
   22,080.48x = 425,270,044.80
5. Step 5: Solve for x
   x = 425,270,044.80/22,080.48
6. Step 6: Final answer
   x = 19,260