Finding the Fourth Proportional to 18,739, 25,859.89 and 10,355.50

Step by Step Solution

1. Step 1: Write the proportion equation
   18,739 : 25,859.89 = 10,355.50 : x
2. Step 2: Convert to fraction form
   18,739/25,859.89 = 10,355.50/x
3. Step 3: Cross multiply
   18,739x = 25,859.89 × 10,355.50
4. Step 4: Simplify right side
   18,739x = 267,792,090.90
5. Step 5: Solve for x
   x = 267,792,090.90/18,739
6. Step 6: Final answer
   x = 14,290.63