Finding the Third Proportional to 215,818 and 322,429

Step by Step Solution

1. Step 1: Write the proportion equation
   215,818 : 322,429 = 322,429 : x
2. Step 2: Convert to fraction form
   215,818/322,429 = 322,429/x
3. Step 3: Cross multiply
   215,818x = 322,429 × 322,429
4. Step 4: Simplify right side
   215,818x = 103,960,460,041
5. Step 5: Solve for x
   x = 103,960,460,041/215,818
6. Step 6: Final answer
   x = 481,704.31