Finding the Third Proportional to 42,121,857 and 64,715,602.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,121,857 : 64,715,602.50 = 64,715,602.50 : x
2. Step 2: Convert to fraction form
   42,121,857/64,715,602.50 = 64,715,602.50/x
3. Step 3: Cross multiply
   42,121,857x = 64,715,602.50 × 64,715,602.50
4. Step 4: Simplify right side
   42,121,857x = 4,188,109,206,938,006
5. Step 5: Solve for x
   x = 4,188,109,206,938,006/42,121,857
6. Step 6: Final answer
   x = 99,428,408.56