Finding the Third Proportional to 42,459 and 54,454.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,459 : 54,454.50 = 54,454.50 : x
2. Step 2: Convert to fraction form
   42,459/54,454.50 = 54,454.50/x
3. Step 3: Cross multiply
   42,459x = 54,454.50 × 54,454.50
4. Step 4: Simplify right side
   42,459x = 2,965,292,570.25
5. Step 5: Solve for x
   x = 2,965,292,570.25/42,459
6. Step 6: Final answer
   x = 69,838.96