Finding the Third Proportional to 42,416,768 and 64,857,729

Step by Step Solution

1. Step 1: Write the proportion equation
   42,416,768 : 64,857,729 = 64,857,729 : x
2. Step 2: Convert to fraction form
   42,416,768/64,857,729 = 64,857,729/x
3. Step 3: Cross multiply
   42,416,768x = 64,857,729 × 64,857,729
4. Step 4: Simplify right side
   42,416,768x = 4,206,525,011,037,441
5. Step 5: Solve for x
   x = 4,206,525,011,037,441/42,416,768
6. Step 6: Final answer
   x = 99,171,276.11