Finding the Fourth Proportional to 19,018.78, 26,245.69 and 10,520.25

Step by Step Solution

1. Step 1: Write the proportion equation
   19,018.78 : 26,245.69 = 10,520.25 : x
2. Step 2: Convert to fraction form
   19,018.78/26,245.69 = 10,520.25/x
3. Step 3: Cross multiply
   19,018.78x = 26,245.69 × 10,520.25
4. Step 4: Simplify right side
   19,018.78x = 276,111,095.50
5. Step 5: Solve for x
   x = 276,111,095.50/19,018.78
6. Step 6: Final answer
   x = 14,517.81