Finding the Fourth Proportional to 25,911.50, 38,870.89 and 12,763.98

Step by Step Solution

1. Step 1: Write the proportion equation
   25,911.50 : 38,870.89 = 12,763.98 : x
2. Step 2: Convert to fraction form
   25,911.50/38,870.89 = 12,763.98/x
3. Step 3: Cross multiply
   25,911.50x = 38,870.89 × 12,763.98
4. Step 4: Simplify right side
   25,911.50x = 496,147,262.54
5. Step 5: Solve for x
   x = 496,147,262.54/25,911.50
6. Step 6: Final answer
   x = 19,147.77