Finding the Fourth Proportional to 21,786.87, 30,065.88 and 12,355.43

Step by Step Solution

1. Step 1: Write the proportion equation
   21,786.87 : 30,065.88 = 12,355.43 : x
2. Step 2: Convert to fraction form
   21,786.87/30,065.88 = 12,355.43/x
3. Step 3: Cross multiply
   21,786.87x = 30,065.88 × 12,355.43
4. Step 4: Simplify right side
   21,786.87x = 371,476,875.73
5. Step 5: Solve for x
   x = 371,476,875.73/21,786.87
6. Step 6: Final answer
   x = 17,050.49