Finding the Third Proportional to 42,415,365.75 and 64,856,688

Step by Step Solution

1. Step 1: Write the proportion equation
   42,415,365.75 : 64,856,688 = 64,856,688 : x
2. Step 2: Convert to fraction form
   42,415,365.75/64,856,688 = 64,856,688/x
3. Step 3: Cross multiply
   42,415,365.75x = 64,856,688 × 64,856,688
4. Step 4: Simplify right side
   42,415,365.75x = 4,206,389,978,329,344
5. Step 5: Solve for x
   x = 4,206,389,978,329,344/42,415,365.75
6. Step 6: Final answer
   x = 99,171,371.13