Finding the Third Proportional to 78,490.50 and 100,785

Step by Step Solution

1. Step 1: Write the proportion equation
   78,490.50 : 100,785 = 100,785 : x
2. Step 2: Convert to fraction form
   78,490.50/100,785 = 100,785/x
3. Step 3: Cross multiply
   78,490.50x = 100,785 × 100,785
4. Step 4: Simplify right side
   78,490.50x = 10,157,616,225
5. Step 5: Solve for x
   x = 10,157,616,225/78,490.50
6. Step 6: Final answer
   x = 129,412.05