Finding the Third Proportional to 617,142 and 818,878.50

Step by Step Solution

1. Step 1: Write the proportion equation
   617,142 : 818,878.50 = 818,878.50 : x
2. Step 2: Convert to fraction form
   617,142/818,878.50 = 818,878.50/x
3. Step 3: Cross multiply
   617,142x = 818,878.50 × 818,878.50
4. Step 4: Simplify right side
   617,142x = 670,561,997,762.25
5. Step 5: Solve for x
   x = 670,561,997,762.25/617,142
6. Step 6: Final answer
   x = 1,086,560.30