Finding the Third Proportional to 5,158.69 and 12,091.78

Step by Step Solution

1. Step 1: Write the proportion equation
   5,158.69 : 12,091.78 = 12,091.78 : x
2. Step 2: Convert to fraction form
   5,158.69/12,091.78 = 12,091.78/x
3. Step 3: Cross multiply
   5,158.69x = 12,091.78 × 12,091.78
4. Step 4: Simplify right side
   5,158.69x = 146,211,173.80
5. Step 5: Solve for x
   x = 146,211,173.80/5,158.69
6. Step 6: Final answer
   x = 28,342.71