Finding the Third Proportional to 2,490.19 and 5,392.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,490.19 : 5,392.69 = 5,392.69 : x
2. Step 2: Convert to fraction form
   2,490.19/5,392.69 = 5,392.69/x
3. Step 3: Cross multiply
   2,490.19x = 5,392.69 × 5,392.69
4. Step 4: Simplify right side
   2,490.19x = 29,081,078.47
5. Step 5: Solve for x
   x = 29,081,078.47/2,490.19
6. Step 6: Final answer
   x = 11,678.27