Finding the Third Proportional to 79,280 and 105,690

Step by Step Solution

1. Step 1: Write the proportion equation
   79,280 : 105,690 = 105,690 : x
2. Step 2: Convert to fraction form
   79,280/105,690 = 105,690/x
3. Step 3: Cross multiply
   79,280x = 105,690 × 105,690
4. Step 4: Simplify right side
   79,280x = 11,170,376,100
5. Step 5: Solve for x
   x = 11,170,376,100/79,280
6. Step 6: Final answer
   x = 140,897.78