Finding the Fourth Proportional to 21,810.72, 32,721.30 and 7,021.02

Step by Step Solution

1. Step 1: Write the proportion equation
   21,810.72 : 32,721.30 = 7,021.02 : x
2. Step 2: Convert to fraction form
   21,810.72/32,721.30 = 7,021.02/x
3. Step 3: Cross multiply
   21,810.72x = 32,721.30 × 7,021.02
4. Step 4: Simplify right side
   21,810.72x = 229,736,901.73
5. Step 5: Solve for x
   x = 229,736,901.73/21,810.72
6. Step 6: Final answer
   x = 10,533.21