Finding the Fourth Proportional to 12,501.11, 18,751.69 and 5,105.57

Step by Step Solution

1. Step 1: Write the proportion equation
   12,501.11 : 18,751.69 = 5,105.57 : x
2. Step 2: Convert to fraction form
   12,501.11/18,751.69 = 5,105.57/x
3. Step 3: Cross multiply
   12,501.11x = 18,751.69 × 5,105.57
4. Step 4: Simplify right side
   12,501.11x = 95,738,065.91
5. Step 5: Solve for x
   x = 95,738,065.91/12,501.11
6. Step 6: Final answer
   x = 7,658.37