Finding the Third Proportional to 17,911 and 31,487

Step by Step Solution

1. Step 1: Write the proportion equation
   17,911 : 31,487 = 31,487 : x
2. Step 2: Convert to fraction form
   17,911/31,487 = 31,487/x
3. Step 3: Cross multiply
   17,911x = 31,487 × 31,487
4. Step 4: Simplify right side
   17,911x = 991,431,169
5. Step 5: Solve for x
   x = 991,431,169/17,911
6. Step 6: Final answer
   x = 55,353.20