Finding the Third Proportional to 139,271 and 209,215.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,271 : 209,215.50 = 209,215.50 : x
2. Step 2: Convert to fraction form
   139,271/209,215.50 = 209,215.50/x
3. Step 3: Cross multiply
   139,271x = 209,215.50 × 209,215.50
4. Step 4: Simplify right side
   139,271x = 43,771,125,440.25
5. Step 5: Solve for x
   x = 43,771,125,440.25/139,271
6. Step 6: Final answer
   x = 314,287.44