Finding the Fourth Proportional to 21,018.04, 29,005.01 and 12,065.31

Step by Step Solution

1. Step 1: Write the proportion equation
   21,018.04 : 29,005.01 = 12,065.31 : x
2. Step 2: Convert to fraction form
   21,018.04/29,005.01 = 12,065.31/x
3. Step 3: Cross multiply
   21,018.04x = 29,005.01 × 12,065.31
4. Step 4: Simplify right side
   21,018.04x = 349,954,437.20
5. Step 5: Solve for x
   x = 349,954,437.20/21,018.04
6. Step 6: Final answer
   x = 16,650.19