Finding the Fourth Proportional to 25,456, 35,129.76 and 14,278.72

Step by Step Solution

1. Step 1: Write the proportion equation
   25,456 : 35,129.76 = 14,278.72 : x
2. Step 2: Convert to fraction form
   25,456/35,129.76 = 14,278.72/x
3. Step 3: Cross multiply
   25,456x = 35,129.76 × 14,278.72
4. Step 4: Simplify right side
   25,456x = 501,608,006.71
5. Step 5: Solve for x
   x = 501,608,006.71/25,456
6. Step 6: Final answer
   x = 19,704.90