Finding the Fourth Proportional to 18,178.89, 25,086.74 and 10,221.18

Step by Step Solution

1. Step 1: Write the proportion equation
   18,178.89 : 25,086.74 = 10,221.18 : x
2. Step 2: Convert to fraction form
   18,178.89/25,086.74 = 10,221.18/x
3. Step 3: Cross multiply
   18,178.89x = 25,086.74 × 10,221.18
4. Step 4: Simplify right side
   18,178.89x = 256,416,085.15
5. Step 5: Solve for x
   x = 256,416,085.15/18,178.89
6. Step 6: Final answer
   x = 14,105.16