Finding the Third Proportional to 78,479.50 and 100,768.50

Step by Step Solution

1. Step 1: Write the proportion equation
   78,479.50 : 100,768.50 = 100,768.50 : x
2. Step 2: Convert to fraction form
   78,479.50/100,768.50 = 100,768.50/x
3. Step 3: Cross multiply
   78,479.50x = 100,768.50 × 100,768.50
4. Step 4: Simplify right side
   78,479.50x = 10,154,290,592.25
5. Step 5: Solve for x
   x = 10,154,290,592.25/78,479.50
6. Step 6: Final answer
   x = 129,387.81