Finding the Fourth Proportional to 21,782.58, 30,061.74 and 12,351.78

Step by Step Solution

1. Step 1: Write the proportion equation
   21,782.58 : 30,061.74 = 12,351.78 : x
2. Step 2: Convert to fraction form
   21,782.58/30,061.74 = 12,351.78/x
3. Step 3: Cross multiply
   21,782.58x = 30,061.74 × 12,351.78
4. Step 4: Simplify right side
   21,782.58x = 371,315,998.90
5. Step 5: Solve for x
   x = 371,315,998.90/21,782.58
6. Step 6: Final answer
   x = 17,046.47