Finding the Third Proportional to 63,458 and 89,139

Step by Step Solution

1. Step 1: Write the proportion equation
   63,458 : 89,139 = 89,139 : x
2. Step 2: Convert to fraction form
   63,458/89,139 = 89,139/x
3. Step 3: Cross multiply
   63,458x = 89,139 × 89,139
4. Step 4: Simplify right side
   63,458x = 7,945,761,321
5. Step 5: Solve for x
   x = 7,945,761,321/63,458
6. Step 6: Final answer
   x = 125,212.92