Finding the Third Proportional to 139,788,672 and 218,809,359

Step by Step Solution

1. Step 1: Write the proportion equation
   139,788,672 : 218,809,359 = 218,809,359 : x
2. Step 2: Convert to fraction form
   139,788,672/218,809,359 = 218,809,359/x
3. Step 3: Cross multiply
   139,788,672x = 218,809,359 × 218,809,359
4. Step 4: Simplify right side
   139,788,672x = 47,877,535,585,990,880
5. Step 5: Solve for x
   x = 47,877,535,585,990,880/139,788,672
6. Step 6: Final answer
   x = 342,499,394.99