Finding the Fourth Proportional to 12,990.12, 17,914.41 and 8,512.25

Step by Step Solution

1. Step 1: Write the proportion equation
   12,990.12 : 17,914.41 = 8,512.25 : x
2. Step 2: Convert to fraction form
   12,990.12/17,914.41 = 8,512.25/x
3. Step 3: Cross multiply
   12,990.12x = 17,914.41 × 8,512.25
4. Step 4: Simplify right side
   12,990.12x = 152,491,846.95
5. Step 5: Solve for x
   x = 152,491,846.95/12,990.12
6. Step 6: Final answer
   x = 11,739.06