Finding the Third Proportional to 18,721.13 and 31,483.69

Step by Step Solution

1. Step 1: Write the proportion equation
   18,721.13 : 31,483.69 = 31,483.69 : x
2. Step 2: Convert to fraction form
   18,721.13/31,483.69 = 31,483.69/x
3. Step 3: Cross multiply
   18,721.13x = 31,483.69 × 31,483.69
4. Step 4: Simplify right side
   18,721.13x = 991,222,578.60
5. Step 5: Solve for x
   x = 991,222,578.60/18,721.13
6. Step 6: Final answer
   x = 52,946.74