Finding the Third Proportional to 31,510,678 and 68,399,216

Step by Step Solution

1. Step 1: Write the proportion equation
   31,510,678 : 68,399,216 = 68,399,216 : x
2. Step 2: Convert to fraction form
   31,510,678/68,399,216 = 68,399,216/x
3. Step 3: Cross multiply
   31,510,678x = 68,399,216 × 68,399,216
4. Step 4: Simplify right side
   31,510,678x = 4,678,452,749,414,656
5. Step 5: Solve for x
   x = 4,678,452,749,414,656/31,510,678
6. Step 6: Final answer
   x = 148,471,979.86