Finding the Third Proportional to 68,211 and 139,801.50

Step by Step Solution

1. Step 1: Write the proportion equation
   68,211 : 139,801.50 = 139,801.50 : x
2. Step 2: Convert to fraction form
   68,211/139,801.50 = 139,801.50/x
3. Step 3: Cross multiply
   68,211x = 139,801.50 × 139,801.50
4. Step 4: Simplify right side
   68,211x = 19,544,459,402.25
5. Step 5: Solve for x
   x = 19,544,459,402.25/68,211
6. Step 6: Final answer
   x = 286,529.44