Finding the Third Proportional to 42,067,939.50 and 64,621,503

Step by Step Solution

1. Step 1: Write the proportion equation
   42,067,939.50 : 64,621,503 = 64,621,503 : x
2. Step 2: Convert to fraction form
   42,067,939.50/64,621,503 = 64,621,503/x
3. Step 3: Cross multiply
   42,067,939.50x = 64,621,503 × 64,621,503
4. Step 4: Simplify right side
   42,067,939.50x = 4,175,938,649,979,009
5. Step 5: Solve for x
   x = 4,175,938,649,979,009/42,067,939.50
6. Step 6: Final answer
   x = 99,266,536.46