Finding the Third Proportional to 139,323 and 208,660.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,323 : 208,660.50 = 208,660.50 : x
2. Step 2: Convert to fraction form
   139,323/208,660.50 = 208,660.50/x
3. Step 3: Cross multiply
   139,323x = 208,660.50 × 208,660.50
4. Step 4: Simplify right side
   139,323x = 43,539,204,260.25
5. Step 5: Solve for x
   x = 43,539,204,260.25/139,323
6. Step 6: Final answer
   x = 312,505.50