Finding the Fourth Proportional to 21,480.28, 29,640.81 and 12,047.02

Step by Step Solution

1. Step 1: Write the proportion equation
   21,480.28 : 29,640.81 = 12,047.02 : x
2. Step 2: Convert to fraction form
   21,480.28/29,640.81 = 12,047.02/x
3. Step 3: Cross multiply
   21,480.28x = 29,640.81 × 12,047.02
4. Step 4: Simplify right side
   21,480.28x = 357,083,430.89
5. Step 5: Solve for x
   x = 357,083,430.89/21,480.28
6. Step 6: Final answer
   x = 16,623.78