Finding the Third Proportional to 51,043,976 and 78,458,256

Step by Step Solution

1. Step 1: Write the proportion equation
   51,043,976 : 78,458,256 = 78,458,256 : x
2. Step 2: Convert to fraction form
   51,043,976/78,458,256 = 78,458,256/x
3. Step 3: Cross multiply
   51,043,976x = 78,458,256 × 78,458,256
4. Step 4: Simplify right side
   51,043,976x = 6,155,697,934,561,536
5. Step 5: Solve for x
   x = 6,155,697,934,561,536/51,043,976
6. Step 6: Final answer
   x = 120,595,972.67