Finding the Fourth Proportional to 8,412.12, 12,518.89 and 8,131.83

Step by Step Solution

1. Step 1: Write the proportion equation
   8,412.12 : 12,518.89 = 8,131.83 : x
2. Step 2: Convert to fraction form
   8,412.12/12,518.89 = 8,131.83/x
3. Step 3: Cross multiply
   8,412.12x = 12,518.89 × 8,131.83
4. Step 4: Simplify right side
   8,412.12x = 101,801,485.27
5. Step 5: Solve for x
   x = 101,801,485.27/8,412.12
6. Step 6: Final answer
   x = 12,101.76