Finding the Third Proportional to 398,355 and 609,652.50

Step by Step Solution

1. Step 1: Write the proportion equation
   398,355 : 609,652.50 = 609,652.50 : x
2. Step 2: Convert to fraction form
   398,355/609,652.50 = 609,652.50/x
3. Step 3: Cross multiply
   398,355x = 609,652.50 × 609,652.50
4. Step 4: Simplify right side
   398,355x = 371,676,170,756.25
5. Step 5: Solve for x
   x = 371,676,170,756.25/398,355
6. Step 6: Final answer
   x = 933,027.50