Finding the Third Proportional to 42,309 and 64,818

Step by Step Solution

1. Step 1: Write the proportion equation
   42,309 : 64,818 = 64,818 : x
2. Step 2: Convert to fraction form
   42,309/64,818 = 64,818/x
3. Step 3: Cross multiply
   42,309x = 64,818 × 64,818
4. Step 4: Simplify right side
   42,309x = 4,201,373,124
5. Step 5: Solve for x
   x = 4,201,373,124/42,309
6. Step 6: Final answer
   x = 99,302.11