Finding the Third Proportional to 11.77 and 15.83

Step by Step Solution

1. Step 1: Write the proportion equation
   11.77 : 15.83 = 15.83 : x
2. Step 2: Convert to fraction form
   11.77/15.83 = 15.83/x
3. Step 3: Cross multiply
   11.77x = 15.83 × 15.83
4. Step 4: Simplify right side
   11.77x = 250.61
5. Step 5: Solve for x
   x = 250.61/11.77
6. Step 6: Final answer
   x = 21.29