Finding the Third Proportional to 156,722 and 220,216

Step by Step Solution

1. Step 1: Write the proportion equation
   156,722 : 220,216 = 220,216 : x
2. Step 2: Convert to fraction form
   156,722/220,216 = 220,216/x
3. Step 3: Cross multiply
   156,722x = 220,216 × 220,216
4. Step 4: Simplify right side
   156,722x = 48,495,086,656
5. Step 5: Solve for x
   x = 48,495,086,656/156,722
6. Step 6: Final answer
   x = 309,433.82