Finding the Third Proportional to 51,043,899 and 78,458,131.50

Step by Step Solution

1. Step 1: Write the proportion equation
   51,043,899 : 78,458,131.50 = 78,458,131.50 : x
2. Step 2: Convert to fraction form
   51,043,899/78,458,131.50 = 78,458,131.50/x
3. Step 3: Cross multiply
   51,043,899x = 78,458,131.50 × 78,458,131.50
4. Step 4: Simplify right side
   51,043,899x = 6,155,678,398,471,292
5. Step 5: Solve for x
   x = 6,155,678,398,471,292/51,043,899
6. Step 6: Final answer
   x = 120,595,771.86