Finding the Third Proportional to 210,816 and 453,870

Step by Step Solution

1. Step 1: Write the proportion equation
   210,816 : 453,870 = 453,870 : x
2. Step 2: Convert to fraction form
   210,816/453,870 = 453,870/x
3. Step 3: Cross multiply
   210,816x = 453,870 × 453,870
4. Step 4: Simplify right side
   210,816x = 205,997,976,900
5. Step 5: Solve for x
   x = 205,997,976,900/210,816
6. Step 6: Final answer
   x = 977,145.84