Finding the Third Proportional to 210,721.50 and 456,435

Step by Step Solution

1. Step 1: Write the proportion equation
   210,721.50 : 456,435 = 456,435 : x
2. Step 2: Convert to fraction form
   210,721.50/456,435 = 456,435/x
3. Step 3: Cross multiply
   210,721.50x = 456,435 × 456,435
4. Step 4: Simplify right side
   210,721.50x = 208,332,909,225
5. Step 5: Solve for x
   x = 208,332,909,225/210,721.50
6. Step 6: Final answer
   x = 988,664.70