Finding the Third Proportional to 309,139,243 and 666,704,680

Step by Step Solution

1. Step 1: Write the proportion equation
   309,139,243 : 666,704,680 = 666,704,680 : x
2. Step 2: Convert to fraction form
   309,139,243/666,704,680 = 666,704,680/x
3. Step 3: Cross multiply
   309,139,243x = 666,704,680 × 666,704,680
4. Step 4: Simplify right side
   309,139,243x = 444,495,130,333,902,400
5. Step 5: Solve for x
   x = 444,495,130,333,902,400/309,139,243
6. Step 6: Final answer
   x = 1,437,847,637.91