Finding the Third Proportional to 612,057 and 918,085.50

Step by Step Solution

1. Step 1: Write the proportion equation
   612,057 : 918,085.50 = 918,085.50 : x
2. Step 2: Convert to fraction form
   612,057/918,085.50 = 918,085.50/x
3. Step 3: Cross multiply
   612,057x = 918,085.50 × 918,085.50
4. Step 4: Simplify right side
   612,057x = 842,880,985,310.25
5. Step 5: Solve for x
   x = 842,880,985,310.25/612,057
6. Step 6: Final answer
   x = 1,377,128.25