Finding the Third Proportional to 611,907 and 860,178.50

Step by Step Solution

1. Step 1: Write the proportion equation
   611,907 : 860,178.50 = 860,178.50 : x
2. Step 2: Convert to fraction form
   611,907/860,178.50 = 860,178.50/x
3. Step 3: Cross multiply
   611,907x = 860,178.50 × 860,178.50
4. Step 4: Simplify right side
   611,907x = 739,907,051,862.25
5. Step 5: Solve for x
   x = 739,907,051,862.25/611,907
6. Step 6: Final answer
   x = 1,209,182.20