Finding the Third Proportional to 67,776 and 139,656

Step by Step Solution

1. Step 1: Write the proportion equation
   67,776 : 139,656 = 139,656 : x
2. Step 2: Convert to fraction form
   67,776/139,656 = 139,656/x
3. Step 3: Cross multiply
   67,776x = 139,656 × 139,656
4. Step 4: Simplify right side
   67,776x = 19,503,798,336
5. Step 5: Solve for x
   x = 19,503,798,336/67,776
6. Step 6: Final answer
   x = 287,768.51