Finding the Third Proportional to 42,591 and 87,915

Step by Step Solution

1. Step 1: Write the proportion equation
   42,591 : 87,915 = 87,915 : x
2. Step 2: Convert to fraction form
   42,591/87,915 = 87,915/x
3. Step 3: Cross multiply
   42,591x = 87,915 × 87,915
4. Step 4: Simplify right side
   42,591x = 7,729,047,225
5. Step 5: Solve for x
   x = 7,729,047,225/42,591
6. Step 6: Final answer
   x = 181,471.37