Finding the Third Proportional to 2,445.91 and 5,290.63

Step by Step Solution

1. Step 1: Write the proportion equation
   2,445.91 : 5,290.63 = 5,290.63 : x
2. Step 2: Convert to fraction form
   2,445.91/5,290.63 = 5,290.63/x
3. Step 3: Cross multiply
   2,445.91x = 5,290.63 × 5,290.63
4. Step 4: Simplify right side
   2,445.91x = 27,990,712.89
5. Step 5: Solve for x
   x = 27,990,712.89/2,445.91
6. Step 6: Final answer
   x = 11,443.90