Finding the Third Proportional to 611,916 and 860,190.50

Step by Step Solution

1. Step 1: Write the proportion equation
   611,916 : 860,190.50 = 860,190.50 : x
2. Step 2: Convert to fraction form
   611,916/860,190.50 = 860,190.50/x
3. Step 3: Cross multiply
   611,916x = 860,190.50 × 860,190.50
4. Step 4: Simplify right side
   611,916x = 739,927,696,290.25
5. Step 5: Solve for x
   x = 739,927,696,290.25/611,916
6. Step 6: Final answer
   x = 1,209,198.15