Finding the Third Proportional to 69,120 and 100,800

Step by Step Solution

1. Step 1: Write the proportion equation
   69,120 : 100,800 = 100,800 : x
2. Step 2: Convert to fraction form
   69,120/100,800 = 100,800/x
3. Step 3: Cross multiply
   69,120x = 100,800 × 100,800
4. Step 4: Simplify right side
   69,120x = 10,160,640,000
5. Step 5: Solve for x
   x = 10,160,640,000/69,120
6. Step 6: Final answer
   x = 147,000