Finding the Third Proportional to 15,688.69 and 18,442.69

Step by Step Solution

1. Step 1: Write the proportion equation
   15,688.69 : 18,442.69 = 18,442.69 : x
2. Step 2: Convert to fraction form
   15,688.69/18,442.69 = 18,442.69/x
3. Step 3: Cross multiply
   15,688.69x = 18,442.69 × 18,442.69
4. Step 4: Simplify right side
   15,688.69x = 340,132,722.22
5. Step 5: Solve for x
   x = 340,132,722.22/15,688.69
6. Step 6: Final answer
   x = 21,680.13