Finding the Fourth Proportional to 21,147, 31,720.76 and 10,054.76

Step by Step Solution

1. Step 1: Write the proportion equation
   21,147 : 31,720.76 = 10,054.76 : x
2. Step 2: Convert to fraction form
   21,147/31,720.76 = 10,054.76/x
3. Step 3: Cross multiply
   21,147x = 31,720.76 × 10,054.76
4. Step 4: Simplify right side
   21,147x = 318,944,628.82
5. Step 5: Solve for x
   x = 318,944,628.82/21,147
6. Step 6: Final answer
   x = 15,082.26