Finding the Third Proportional to 68,300 and 139,972

Step by Step Solution

1. Step 1: Write the proportion equation
   68,300 : 139,972 = 139,972 : x
2. Step 2: Convert to fraction form
   68,300/139,972 = 139,972/x
3. Step 3: Cross multiply
   68,300x = 139,972 × 139,972
4. Step 4: Simplify right side
   68,300x = 19,592,160,784
5. Step 5: Solve for x
   x = 19,592,160,784/68,300
6. Step 6: Final answer
   x = 286,854.48