Finding the Third Proportional to 138,673 and 208,989.50

Step by Step Solution

1. Step 1: Write the proportion equation
   138,673 : 208,989.50 = 208,989.50 : x
2. Step 2: Convert to fraction form
   138,673/208,989.50 = 208,989.50/x
3. Step 3: Cross multiply
   138,673x = 208,989.50 × 208,989.50
4. Step 4: Simplify right side
   138,673x = 43,676,611,110.25
5. Step 5: Solve for x
   x = 43,676,611,110.25/138,673
6. Step 6: Final answer
   x = 314,961.18