Finding the Third Proportional to 78,855,936 and 172,844,406

Step by Step Solution

1. Step 1: Write the proportion equation
   78,855,936 : 172,844,406 = 172,844,406 : x
2. Step 2: Convert to fraction form
   78,855,936/172,844,406 = 172,844,406/x
3. Step 3: Cross multiply
   78,855,936x = 172,844,406 × 172,844,406
4. Step 4: Simplify right side
   78,855,936x = 29,875,188,685,492,836
5. Step 5: Solve for x
   x = 29,875,188,685,492,836/78,855,936
6. Step 6: Final answer
   x = 378,857,828.60