Finding the Third Proportional to 20,490 and 30,621.38

Step by Step Solution

1. Step 1: Write the proportion equation
   20,490 : 30,621.38 = 30,621.38 : x
2. Step 2: Convert to fraction form
   20,490/30,621.38 = 30,621.38/x
3. Step 3: Cross multiply
   20,490x = 30,621.38 × 30,621.38
4. Step 4: Simplify right side
   20,490x = 937,668,606.89
5. Step 5: Solve for x
   x = 937,668,606.89/20,490
6. Step 6: Final answer
   x = 45,762.26