Finding the Third Proportional to 5,158.69 and 10,871.72

Step by Step Solution

1. Step 1: Write the proportion equation
   5,158.69 : 10,871.72 = 10,871.72 : x
2. Step 2: Convert to fraction form
   5,158.69/10,871.72 = 10,871.72/x
3. Step 3: Cross multiply
   5,158.69x = 10,871.72 × 10,871.72
4. Step 4: Simplify right side
   5,158.69x = 118,194,268.58
5. Step 5: Solve for x
   x = 118,194,268.58/5,158.69
6. Step 6: Final answer
   x = 22,911.69