Finding the Third Proportional to 42,121,623 and 64,715,218.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,121,623 : 64,715,218.50 = 64,715,218.50 : x
2. Step 2: Convert to fraction form
   42,121,623/64,715,218.50 = 64,715,218.50/x
3. Step 3: Cross multiply
   42,121,623x = 64,715,218.50 × 64,715,218.50
4. Step 4: Simplify right side
   42,121,623x = 4,188,059,505,502,742
5. Step 5: Solve for x
   x = 4,188,059,505,502,742/42,121,623
6. Step 6: Final answer
   x = 99,427,780.96