Finding the Third Proportional to 42,558 and 64,989

Step by Step Solution

1. Step 1: Write the proportion equation
   42,558 : 64,989 = 64,989 : x
2. Step 2: Convert to fraction form
   42,558/64,989 = 64,989/x
3. Step 3: Cross multiply
   42,558x = 64,989 × 64,989
4. Step 4: Simplify right side
   42,558x = 4,223,570,121
5. Step 5: Solve for x
   x = 4,223,570,121/42,558
6. Step 6: Final answer
   x = 99,242.68