Finding the Third Proportional to 139,788 and 210,330

Step by Step Solution

1. Step 1: Write the proportion equation
   139,788 : 210,330 = 210,330 : x
2. Step 2: Convert to fraction form
   139,788/210,330 = 210,330/x
3. Step 3: Cross multiply
   139,788x = 210,330 × 210,330
4. Step 4: Simplify right side
   139,788x = 44,238,708,900
5. Step 5: Solve for x
   x = 44,238,708,900/139,788
6. Step 6: Final answer
   x = 316,470.00