Finding the Third Proportional to 156,392 and 258,850

Step by Step Solution

1. Step 1: Write the proportion equation
   156,392 : 258,850 = 258,850 : x
2. Step 2: Convert to fraction form
   156,392/258,850 = 258,850/x
3. Step 3: Cross multiply
   156,392x = 258,850 × 258,850
4. Step 4: Simplify right side
   156,392x = 67,003,322,500
5. Step 5: Solve for x
   x = 67,003,322,500/156,392
6. Step 6: Final answer
   x = 428,431.91