Finding the Third Proportional to 136,736 and 206,990.50

Step by Step Solution

1. Step 1: Write the proportion equation
   136,736 : 206,990.50 = 206,990.50 : x
2. Step 2: Convert to fraction form
   136,736/206,990.50 = 206,990.50/x
3. Step 3: Cross multiply
   136,736x = 206,990.50 × 206,990.50
4. Step 4: Simplify right side
   136,736x = 42,845,067,090.25
5. Step 5: Solve for x
   x = 42,845,067,090.25/136,736
6. Step 6: Final answer
   x = 313,341.53