Finding the Fourth Proportional to 21,700.92, 29,947.54 and 12,748.56

Step by Step Solution

1. Step 1: Write the proportion equation
   21,700.92 : 29,947.54 = 12,748.56 : x
2. Step 2: Convert to fraction form
   21,700.92/29,947.54 = 12,748.56/x
3. Step 3: Cross multiply
   21,700.92x = 29,947.54 × 12,748.56
4. Step 4: Simplify right side
   21,700.92x = 381,788,010.54
5. Step 5: Solve for x
   x = 381,788,010.54/21,700.92
6. Step 6: Final answer
   x = 17,593.17