Finding the Fourth Proportional to 13,072.39, 18,042.50 and 7,766.18

Step by Step Solution

1. Step 1: Write the proportion equation
   13,072.39 : 18,042.50 = 7,766.18 : x
2. Step 2: Convert to fraction form
   13,072.39/18,042.50 = 7,766.18/x
3. Step 3: Cross multiply
   13,072.39x = 18,042.50 × 7,766.18
4. Step 4: Simplify right side
   13,072.39x = 140,121,255.83
5. Step 5: Solve for x
   x = 140,121,255.83/13,072.39
6. Step 6: Final answer
   x = 10,718.87