Finding the Third Proportional to 264,408 and 402,808.50

Step by Step Solution

1. Step 1: Write the proportion equation
   264,408 : 402,808.50 = 402,808.50 : x
2. Step 2: Convert to fraction form
   264,408/402,808.50 = 402,808.50/x
3. Step 3: Cross multiply
   264,408x = 402,808.50 × 402,808.50
4. Step 4: Simplify right side
   264,408x = 162,254,687,672.25
5. Step 5: Solve for x
   x = 162,254,687,672.25/264,408
6. Step 6: Final answer
   x = 613,652.72