Finding the Third Proportional to 58,915 and 89,231

Step by Step Solution

1. Step 1: Write the proportion equation
   58,915 : 89,231 = 89,231 : x
2. Step 2: Convert to fraction form
   58,915/89,231 = 89,231/x
3. Step 3: Cross multiply
   58,915x = 89,231 × 89,231
4. Step 4: Simplify right side
   58,915x = 7,962,171,361
5. Step 5: Solve for x
   x = 7,962,171,361/58,915
6. Step 6: Final answer
   x = 135,146.76