Finding the Fourth Proportional to 21,965.12, 30,310.77 and 12,406.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,965.12 : 30,310.77 = 12,406.10 : x
2. Step 2: Convert to fraction form
   21,965.12/30,310.77 = 12,406.10/x
3. Step 3: Cross multiply
   21,965.12x = 30,310.77 × 12,406.10
4. Step 4: Simplify right side
   21,965.12x = 376,038,443.70
5. Step 5: Solve for x
   x = 376,038,443.70/21,965.12
6. Step 6: Final answer
   x = 17,119.80