Finding the Third Proportional to 42,779 and 68,921.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,779 : 68,921.50 = 68,921.50 : x
2. Step 2: Convert to fraction form
   42,779/68,921.50 = 68,921.50/x
3. Step 3: Cross multiply
   42,779x = 68,921.50 × 68,921.50
4. Step 4: Simplify right side
   42,779x = 4,750,173,162.25
5. Step 5: Solve for x
   x = 4,750,173,162.25/42,779
6. Step 6: Final answer
   x = 111,039.84