Finding the Third Proportional to 61,458 and 87,039

Step by Step Solution

1. Step 1: Write the proportion equation
   61,458 : 87,039 = 87,039 : x
2. Step 2: Convert to fraction form
   61,458/87,039 = 87,039/x
3. Step 3: Cross multiply
   61,458x = 87,039 × 87,039
4. Step 4: Simplify right side
   61,458x = 7,575,787,521
5. Step 5: Solve for x
   x = 7,575,787,521/61,458
6. Step 6: Final answer
   x = 123,267.72