Finding the Third Proportional to 7,042.78 and 10,542.23

Step by Step Solution

1. Step 1: Write the proportion equation
   7,042.78 : 10,542.23 = 10,542.23 : x
2. Step 2: Convert to fraction form
   7,042.78/10,542.23 = 10,542.23/x
3. Step 3: Cross multiply
   7,042.78x = 10,542.23 × 10,542.23
4. Step 4: Simplify right side
   7,042.78x = 111,138,705.62
5. Step 5: Solve for x
   x = 111,138,705.62/7,042.78
6. Step 6: Final answer
   x = 15,780.51