Finding the Third Proportional to 72,678,387 and 111,711,694.50

Step by Step Solution

1. Step 1: Write the proportion equation
   72,678,387 : 111,711,694.50 = 111,711,694.50 : x
2. Step 2: Convert to fraction form
   72,678,387/111,711,694.50 = 111,711,694.50/x
3. Step 3: Cross multiply
   72,678,387x = 111,711,694.50 × 111,711,694.50
4. Step 4: Simplify right side
   72,678,387x = 12,479,502,688,061,330
5. Step 5: Solve for x
   x = 12,479,502,688,061,330/72,678,387
6. Step 6: Final answer
   x = 171,708,580.82