Finding the Third Proportional to 139,866 and 210,960

Step by Step Solution

1. Step 1: Write the proportion equation
   139,866 : 210,960 = 210,960 : x
2. Step 2: Convert to fraction form
   139,866/210,960 = 210,960/x
3. Step 3: Cross multiply
   139,866x = 210,960 × 210,960
4. Step 4: Simplify right side
   139,866x = 44,504,121,600
5. Step 5: Solve for x
   x = 44,504,121,600/139,866
6. Step 6: Final answer
   x = 318,191.14