Finding the Third Proportional to 18,559.13 and 30,640.78

Step by Step Solution

1. Step 1: Write the proportion equation
   18,559.13 : 30,640.78 = 30,640.78 : x
2. Step 2: Convert to fraction form
   18,559.13/30,640.78 = 30,640.78/x
3. Step 3: Cross multiply
   18,559.13x = 30,640.78 × 30,640.78
4. Step 4: Simplify right side
   18,559.13x = 938,857,475.61
5. Step 5: Solve for x
   x = 938,857,475.61/18,559.13
6. Step 6: Final answer
   x = 50,587.38