Finding the Third Proportional to 139,426 and 306,188

Step by Step Solution

1. Step 1: Write the proportion equation
   139,426 : 306,188 = 306,188 : x
2. Step 2: Convert to fraction form
   139,426/306,188 = 306,188/x
3. Step 3: Cross multiply
   139,426x = 306,188 × 306,188
4. Step 4: Simplify right side
   139,426x = 93,751,091,344
5. Step 5: Solve for x
   x = 93,751,091,344/139,426
6. Step 6: Final answer
   x = 672,407.52