Finding the Fourth Proportional to 12,513.20, 18,769.82 and 5,118.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,513.20 : 18,769.82 = 5,118.72 : x
2. Step 2: Convert to fraction form
   12,513.20/18,769.82 = 5,118.72/x
3. Step 3: Cross multiply
   12,513.20x = 18,769.82 × 5,118.72
4. Step 4: Simplify right side
   12,513.20x = 96,077,453.03
5. Step 5: Solve for x
   x = 96,077,453.03/12,513.20
6. Step 6: Final answer
   x = 7,678.09