Finding the Fourth Proportional to 21,072.52, 29,080.91 and 12,120.01

Step by Step Solution

1. Step 1: Write the proportion equation
   21,072.52 : 29,080.91 = 12,120.01 : x
2. Step 2: Convert to fraction form
   21,072.52/29,080.91 = 12,120.01/x
3. Step 3: Cross multiply
   21,072.52x = 29,080.91 × 12,120.01
4. Step 4: Simplify right side
   21,072.52x = 352,460,809.43
5. Step 5: Solve for x
   x = 352,460,809.43/21,072.52
6. Step 6: Final answer
   x = 16,726.09