Finding the Fourth Proportional to 21,665.12, 29,898.24 and 12,710.48

Step by Step Solution

1. Step 1: Write the proportion equation
   21,665.12 : 29,898.24 = 12,710.48 : x
2. Step 2: Convert to fraction form
   21,665.12/29,898.24 = 12,710.48/x
3. Step 3: Cross multiply
   21,665.12x = 29,898.24 × 12,710.48
4. Step 4: Simplify right side
   21,665.12x = 380,020,981.56
5. Step 5: Solve for x
   x = 380,020,981.56/21,665.12
6. Step 6: Final answer
   x = 17,540.68