Finding the Third Proportional to 82,073,578 and 128,079,231

Step by Step Solution

1. Step 1: Write the proportion equation
   82,073,578 : 128,079,231 = 128,079,231 : x
2. Step 2: Convert to fraction form
   82,073,578/128,079,231 = 128,079,231/x
3. Step 3: Cross multiply
   82,073,578x = 128,079,231 × 128,079,231
4. Step 4: Simplify right side
   82,073,578x = 16,404,289,413,551,360
5. Step 5: Solve for x
   x = 16,404,289,413,551,360/82,073,578
6. Step 6: Final answer
   x = 199,872,965.37