Finding the Third Proportional to 3,991.94 and 8,397.28

Step by Step Solution

1. Step 1: Write the proportion equation
   3,991.94 : 8,397.28 = 8,397.28 : x
2. Step 2: Convert to fraction form
   3,991.94/8,397.28 = 8,397.28/x
3. Step 3: Cross multiply
   3,991.94x = 8,397.28 × 8,397.28
4. Step 4: Simplify right side
   3,991.94x = 70,514,332.39
5. Step 5: Solve for x
   x = 70,514,332.39/3,991.94
6. Step 6: Final answer
   x = 17,664.19