Finding the Fourth Proportional to 21,162.17, 31,744.82 and 7,122.13

Step by Step Solution

1. Step 1: Write the proportion equation
   21,162.17 : 31,744.82 = 7,122.13 : x
2. Step 2: Convert to fraction form
   21,162.17/31,744.82 = 7,122.13/x
3. Step 3: Cross multiply
   21,162.17x = 31,744.82 × 7,122.13
4. Step 4: Simplify right side
   21,162.17x = 226,090,673.31
5. Step 5: Solve for x
   x = 226,090,673.31/21,162.17
6. Step 6: Final answer
   x = 10,683.72