Finding the Third Proportional to 139,458 and 210,496.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,458 : 210,496.50 = 210,496.50 : x
2. Step 2: Convert to fraction form
   139,458/210,496.50 = 210,496.50/x
3. Step 3: Cross multiply
   139,458x = 210,496.50 × 210,496.50
4. Step 4: Simplify right side
   139,458x = 44,308,776,512.25
5. Step 5: Solve for x
   x = 44,308,776,512.25/139,458
6. Step 6: Final answer
   x = 317,721.30