Finding the Third Proportional to 78,486 and 111,809

Step by Step Solution

1. Step 1: Write the proportion equation
   78,486 : 111,809 = 111,809 : x
2. Step 2: Convert to fraction form
   78,486/111,809 = 111,809/x
3. Step 3: Cross multiply
   78,486x = 111,809 × 111,809
4. Step 4: Simplify right side
   78,486x = 12,501,252,481
5. Step 5: Solve for x
   x = 12,501,252,481/78,486
6. Step 6: Final answer
   x = 159,280.03