Finding the Fourth Proportional to 13,081.73, 18,046.45 and 7,772.79

Step by Step Solution

1. Step 1: Write the proportion equation
   13,081.73 : 18,046.45 = 7,772.79 : x
2. Step 2: Convert to fraction form
   13,081.73/18,046.45 = 7,772.79/x
3. Step 3: Cross multiply
   13,081.73x = 18,046.45 × 7,772.79
4. Step 4: Simplify right side
   13,081.73x = 140,271,270.87
5. Step 5: Solve for x
   x = 140,271,270.87/13,081.73
6. Step 6: Final answer
   x = 10,722.68