Finding the Third Proportional to 139,864 and 216,964.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,864 : 216,964.50 = 216,964.50 : x
2. Step 2: Convert to fraction form
   139,864/216,964.50 = 216,964.50/x
3. Step 3: Cross multiply
   139,864x = 216,964.50 × 216,964.50
4. Step 4: Simplify right side
   139,864x = 47,073,594,260.25
5. Step 5: Solve for x
   x = 47,073,594,260.25/139,864
6. Step 6: Final answer
   x = 336,566.91