Finding the Third Proportional to 7,715.25 and 18,085.78

Step by Step Solution

1. Step 1: Write the proportion equation
   7,715.25 : 18,085.78 = 18,085.78 : x
2. Step 2: Convert to fraction form
   7,715.25/18,085.78 = 18,085.78/x
3. Step 3: Cross multiply
   7,715.25x = 18,085.78 × 18,085.78
4. Step 4: Simplify right side
   7,715.25x = 327,095,483.42
5. Step 5: Solve for x
   x = 327,095,483.42/7,715.25
6. Step 6: Final answer
   x = 42,395.97