Finding the Third Proportional to 612,108 and 918,166.50

Step by Step Solution

1. Step 1: Write the proportion equation
   612,108 : 918,166.50 = 918,166.50 : x
2. Step 2: Convert to fraction form
   612,108/918,166.50 = 918,166.50/x
3. Step 3: Cross multiply
   612,108x = 918,166.50 × 918,166.50
4. Step 4: Simplify right side
   612,108x = 843,029,721,722.25
5. Step 5: Solve for x
   x = 843,029,721,722.25/612,108
6. Step 6: Final answer
   x = 1,377,256.50