Finding the Fourth Proportional to 18,470, 25,488.78 and 10,086.68

Step by Step Solution

1. Step 1: Write the proportion equation
   18,470 : 25,488.78 = 10,086.68 : x
2. Step 2: Convert to fraction form
   18,470/25,488.78 = 10,086.68/x
3. Step 3: Cross multiply
   18,470x = 25,488.78 × 10,086.68
4. Step 4: Simplify right side
   18,470x = 257,097,167.45
5. Step 5: Solve for x
   x = 257,097,167.45/18,470
6. Step 6: Final answer
   x = 13,919.72