Finding the Fourth Proportional to 21,786.86, 30,064.10 and 12,356.30

Step by Step Solution

1. Step 1: Write the proportion equation
   21,786.86 : 30,064.10 = 12,356.30 : x
2. Step 2: Convert to fraction form
   21,786.86/30,064.10 = 12,356.30/x
3. Step 3: Cross multiply
   21,786.86x = 30,064.10 × 12,356.30
4. Step 4: Simplify right side
   21,786.86x = 371,481,038.83
5. Step 5: Solve for x
   x = 371,481,038.83/21,786.86
6. Step 6: Final answer
   x = 17,050.69