Finding the Third Proportional to 42,690 and 64,173

Step by Step Solution

1. Step 1: Write the proportion equation
   42,690 : 64,173 = 64,173 : x
2. Step 2: Convert to fraction form
   42,690/64,173 = 64,173/x
3. Step 3: Cross multiply
   42,690x = 64,173 × 64,173
4. Step 4: Simplify right side
   42,690x = 4,118,173,929
5. Step 5: Solve for x
   x = 4,118,173,929/42,690
6. Step 6: Final answer
   x = 96,466.95