Finding the Third Proportional to 78,912,760 and 172,910,960

Step by Step Solution

1. Step 1: Write the proportion equation
   78,912,760 : 172,910,960 = 172,910,960 : x
2. Step 2: Convert to fraction form
   78,912,760/172,910,960 = 172,910,960/x
3. Step 3: Cross multiply
   78,912,760x = 172,910,960 × 172,910,960
4. Step 4: Simplify right side
   78,912,760x = 29,898,200,088,121,600
5. Step 5: Solve for x
   x = 29,898,200,088,121,600/78,912,760
6. Step 6: Final answer
   x = 378,876,623.86