Finding the Third Proportional to 68,217.50 and 139,816

Step by Step Solution

1. Step 1: Write the proportion equation
   68,217.50 : 139,816 = 139,816 : x
2. Step 2: Convert to fraction form
   68,217.50/139,816 = 139,816/x
3. Step 3: Cross multiply
   68,217.50x = 139,816 × 139,816
4. Step 4: Simplify right side
   68,217.50x = 19,548,513,856
5. Step 5: Solve for x
   x = 19,548,513,856/68,217.50
6. Step 6: Final answer
   x = 286,561.57