Finding the Fourth Proportional to 21,173.28, 31,768.83 and 10,653

Step by Step Solution

1. Step 1: Write the proportion equation
   21,173.28 : 31,768.83 = 10,653 : x
2. Step 2: Convert to fraction form
   21,173.28/31,768.83 = 10,653/x
3. Step 3: Cross multiply
   21,173.28x = 31,768.83 × 10,653
4. Step 4: Simplify right side
   21,173.28x = 338,433,345.99
5. Step 5: Solve for x
   x = 338,433,345.99/21,173.28
6. Step 6: Final answer
   x = 15,983.98