Finding the Fourth Proportional to 21,062.31, 31,551.09 and 9,979.69

Step by Step Solution

1. Step 1: Write the proportion equation
   21,062.31 : 31,551.09 = 9,979.69 : x
2. Step 2: Convert to fraction form
   21,062.31/31,551.09 = 9,979.69/x
3. Step 3: Cross multiply
   21,062.31x = 31,551.09 × 9,979.69
4. Step 4: Simplify right side
   21,062.31x = 314,870,174.22
5. Step 5: Solve for x
   x = 314,870,174.22/21,062.31
6. Step 6: Final answer
   x = 14,949.46