Finding the Third Proportional to 31,618.69 and 67,879.69

Step by Step Solution

1. Step 1: Write the proportion equation
   31,618.69 : 67,879.69 = 67,879.69 : x
2. Step 2: Convert to fraction form
   31,618.69/67,879.69 = 67,879.69/x
3. Step 3: Cross multiply
   31,618.69x = 67,879.69 × 67,879.69
4. Step 4: Simplify right side
   31,618.69x = 4,607,651,975.10
5. Step 5: Solve for x
   x = 4,607,651,975.10/31,618.69
6. Step 6: Final answer
   x = 145,725.59