Finding the Third Proportional to 42,590 and 64,479

Step by Step Solution

1. Step 1: Write the proportion equation
   42,590 : 64,479 = 64,479 : x
2. Step 2: Convert to fraction form
   42,590/64,479 = 64,479/x
3. Step 3: Cross multiply
   42,590x = 64,479 × 64,479
4. Step 4: Simplify right side
   42,590x = 4,157,541,441
5. Step 5: Solve for x
   x = 4,157,541,441/42,590
6. Step 6: Final answer
   x = 97,617.78