Finding the Third Proportional to 54,915 and 71,139

Step by Step Solution

1. Step 1: Write the proportion equation
   54,915 : 71,139 = 71,139 : x
2. Step 2: Convert to fraction form
   54,915/71,139 = 71,139/x
3. Step 3: Cross multiply
   54,915x = 71,139 × 71,139
4. Step 4: Simplify right side
   54,915x = 5,060,757,321
5. Step 5: Solve for x
   x = 5,060,757,321/54,915
6. Step 6: Final answer
   x = 92,156.19