Finding the Third Proportional to 11,999 and 17,870

Step by Step Solution

1. Step 1: Write the proportion equation
   11,999 : 17,870 = 17,870 : x
2. Step 2: Convert to fraction form
   11,999/17,870 = 17,870/x
3. Step 3: Cross multiply
   11,999x = 17,870 × 17,870
4. Step 4: Simplify right side
   11,999x = 319,336,900
5. Step 5: Solve for x
   x = 319,336,900/11,999
6. Step 6: Final answer
   x = 26,613.63