Finding the Third Proportional to 68,072 and 139,600

Step by Step Solution

1. Step 1: Write the proportion equation
   68,072 : 139,600 = 139,600 : x
2. Step 2: Convert to fraction form
   68,072/139,600 = 139,600/x
3. Step 3: Cross multiply
   68,072x = 139,600 × 139,600
4. Step 4: Simplify right side
   68,072x = 19,488,160,000
5. Step 5: Solve for x
   x = 19,488,160,000/68,072
6. Step 6: Final answer
   x = 286,287.46