Finding the Third Proportional to 11,870 and 18,387

Step by Step Solution

1. Step 1: Write the proportion equation
   11,870 : 18,387 = 18,387 : x
2. Step 2: Convert to fraction form
   11,870/18,387 = 18,387/x
3. Step 3: Cross multiply
   11,870x = 18,387 × 18,387
4. Step 4: Simplify right side
   11,870x = 338,081,769
5. Step 5: Solve for x
   x = 338,081,769/11,870
6. Step 6: Final answer
   x = 28,482.04