Finding the Fourth Proportional to 21,109, 31,659.18 and 10,715.08

Step by Step Solution

1. Step 1: Write the proportion equation
   21,109 : 31,659.18 = 10,715.08 : x
2. Step 2: Convert to fraction form
   21,109/31,659.18 = 10,715.08/x
3. Step 3: Cross multiply
   21,109x = 31,659.18 × 10,715.08
4. Step 4: Simplify right side
   21,109x = 339,230,646.43
5. Step 5: Solve for x
   x = 339,230,646.43/21,109
6. Step 6: Final answer
   x = 16,070.43