Finding the Third Proportional to 210,155 and 456,040

Step by Step Solution

1. Step 1: Write the proportion equation
   210,155 : 456,040 = 456,040 : x
2. Step 2: Convert to fraction form
   210,155/456,040 = 456,040/x
3. Step 3: Cross multiply
   210,155x = 456,040 × 456,040
4. Step 4: Simplify right side
   210,155x = 207,972,481,600
5. Step 5: Solve for x
   x = 207,972,481,600/210,155
6. Step 6: Final answer
   x = 989,614.72