Finding the Third Proportional to 2,290.78 and 5,020.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,290.78 : 5,020.31 = 5,020.31 : x
2. Step 2: Convert to fraction form
   2,290.78/5,020.31 = 5,020.31/x
3. Step 3: Cross multiply
   2,290.78x = 5,020.31 × 5,020.31
4. Step 4: Simplify right side
   2,290.78x = 25,203,537.60
5. Step 5: Solve for x
   x = 25,203,537.60/2,290.78
6. Step 6: Final answer
   x = 11,002.16