Finding the Third Proportional to 1,243.69 and 2,642.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,243.69 : 2,642.63 = 2,642.63 : x
2. Step 2: Convert to fraction form
   1,243.69/2,642.63 = 2,642.63/x
3. Step 3: Cross multiply
   1,243.69x = 2,642.63 × 2,642.63
4. Step 4: Simplify right side
   1,243.69x = 6,983,466.89
5. Step 5: Solve for x
   x = 6,983,466.89/1,243.69
6. Step 6: Final answer
   x = 5,615.13