Finding the Fourth Proportional to 21,151, 31,727.01 and 7,111.21

Step by Step Solution

1. Step 1: Write the proportion equation
   21,151 : 31,727.01 = 7,111.21 : x
2. Step 2: Convert to fraction form
   21,151/31,727.01 = 7,111.21/x
3. Step 3: Cross multiply
   21,151x = 31,727.01 × 7,111.21
4. Step 4: Simplify right side
   21,151x = 225,617,430.78
5. Step 5: Solve for x
   x = 225,617,430.78/21,151
6. Step 6: Final answer
   x = 10,666.99