Finding the Third Proportional to 5,640,742 and 8,719,868

Step by Step Solution

1. Step 1: Write the proportion equation
   5,640,742 : 8,719,868 = 8,719,868 : x
2. Step 2: Convert to fraction form
   5,640,742/8,719,868 = 8,719,868/x
3. Step 3: Cross multiply
   5,640,742x = 8,719,868 × 8,719,868
4. Step 4: Simplify right side
   5,640,742x = 76,036,097,937,424
5. Step 5: Solve for x
   x = 76,036,097,937,424/5,640,742
6. Step 6: Final answer
   x = 13,479,804.24