Finding the Fourth Proportional to 15,839, 21,858.18 and 10,259.72

Step by Step Solution

1. Step 1: Write the proportion equation
   15,839 : 21,858.18 = 10,259.72 : x
2. Step 2: Convert to fraction form
   15,839/21,858.18 = 10,259.72/x
3. Step 3: Cross multiply
   15,839x = 21,858.18 × 10,259.72
4. Step 4: Simplify right side
   15,839x = 224,258,806.51
5. Step 5: Solve for x
   x = 224,258,806.51/15,839
6. Step 6: Final answer
   x = 14,158.65