Finding the Fourth Proportional to 12,855.50, 17,739.85 and 7,112.61

Step by Step Solution

1. Step 1: Write the proportion equation
   12,855.50 : 17,739.85 = 7,112.61 : x
2. Step 2: Convert to fraction form
   12,855.50/17,739.85 = 7,112.61/x
3. Step 3: Cross multiply
   12,855.50x = 17,739.85 × 7,112.61
4. Step 4: Simplify right side
   12,855.50x = 126,176,634.51
5. Step 5: Solve for x
   x = 126,176,634.51/12,855.50
6. Step 6: Final answer
   x = 9,814.99