Finding the Third Proportional to 42,328 and 64,840

Step by Step Solution

1. Step 1: Write the proportion equation
   42,328 : 64,840 = 64,840 : x
2. Step 2: Convert to fraction form
   42,328/64,840 = 64,840/x
3. Step 3: Cross multiply
   42,328x = 64,840 × 64,840
4. Step 4: Simplify right side
   42,328x = 4,204,225,600
5. Step 5: Solve for x
   x = 4,204,225,600/42,328
6. Step 6: Final answer
   x = 99,324.93