Finding the Third Proportional to 18,085.78 and 27,815.91

Step by Step Solution

1. Step 1: Write the proportion equation
   18,085.78 : 27,815.91 = 27,815.91 : x
2. Step 2: Convert to fraction form
   18,085.78/27,815.91 = 27,815.91/x
3. Step 3: Cross multiply
   18,085.78x = 27,815.91 × 27,815.91
4. Step 4: Simplify right side
   18,085.78x = 773,724,640.51
5. Step 5: Solve for x
   x = 773,724,640.51/18,085.78
6. Step 6: Final answer
   x = 42,780.82