Finding the Third Proportional to 42,579 and 64,458

Step by Step Solution

1. Step 1: Write the proportion equation
   42,579 : 64,458 = 64,458 : x
2. Step 2: Convert to fraction form
   42,579/64,458 = 64,458/x
3. Step 3: Cross multiply
   42,579x = 64,458 × 64,458
4. Step 4: Simplify right side
   42,579x = 4,154,833,764
5. Step 5: Solve for x
   x = 4,154,833,764/42,579
6. Step 6: Final answer
   x = 97,579.41