Finding the Third Proportional to 2,486.81 and 5,457.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,486.81 : 5,457.38 = 5,457.38 : x
2. Step 2: Convert to fraction form
   2,486.81/5,457.38 = 5,457.38/x
3. Step 3: Cross multiply
   2,486.81x = 5,457.38 × 5,457.38
4. Step 4: Simplify right side
   2,486.81x = 29,782,941.89
5. Step 5: Solve for x
   x = 29,782,941.89/2,486.81
6. Step 6: Final answer
   x = 11,976.35