Finding the Third Proportional to 67,890 and 105,931

Step by Step Solution

1. Step 1: Write the proportion equation
   67,890 : 105,931 = 105,931 : x
2. Step 2: Convert to fraction form
   67,890/105,931 = 105,931/x
3. Step 3: Cross multiply
   67,890x = 105,931 × 105,931
4. Step 4: Simplify right side
   67,890x = 11,221,376,761
5. Step 5: Solve for x
   x = 11,221,376,761/67,890
6. Step 6: Final answer
   x = 165,287.62