Finding the Third Proportional to 78,492.50 and 100,788

Step by Step Solution

1. Step 1: Write the proportion equation
   78,492.50 : 100,788 = 100,788 : x
2. Step 2: Convert to fraction form
   78,492.50/100,788 = 100,788/x
3. Step 3: Cross multiply
   78,492.50x = 100,788 × 100,788
4. Step 4: Simplify right side
   78,492.50x = 10,158,220,944
5. Step 5: Solve for x
   x = 10,158,220,944/78,492.50
6. Step 6: Final answer
   x = 129,416.45