Finding the Third Proportional to 67,430 and 139,216

Step by Step Solution

1. Step 1: Write the proportion equation
   67,430 : 139,216 = 139,216 : x
2. Step 2: Convert to fraction form
   67,430/139,216 = 139,216/x
3. Step 3: Cross multiply
   67,430x = 139,216 × 139,216
4. Step 4: Simplify right side
   67,430x = 19,381,094,656
5. Step 5: Solve for x
   x = 19,381,094,656/67,430
6. Step 6: Final answer
   x = 287,425.40