Finding the Third Proportional to 78,480.50 and 100,770

Step by Step Solution

1. Step 1: Write the proportion equation
   78,480.50 : 100,770 = 100,770 : x
2. Step 2: Convert to fraction form
   78,480.50/100,770 = 100,770/x
3. Step 3: Cross multiply
   78,480.50x = 100,770 × 100,770
4. Step 4: Simplify right side
   78,480.50x = 10,154,592,900
5. Step 5: Solve for x
   x = 10,154,592,900/78,480.50
6. Step 6: Final answer
   x = 129,390.01