Finding the Fourth Proportional to 14,259.09, 21,389.72 and 3,870.69

Step by Step Solution

1. Step 1: Write the proportion equation
   14,259.09 : 21,389.72 = 3,870.69 : x
2. Step 2: Convert to fraction form
   14,259.09/21,389.72 = 3,870.69/x
3. Step 3: Cross multiply
   14,259.09x = 21,389.72 × 3,870.69
4. Step 4: Simplify right side
   14,259.09x = 82,792,955.95
5. Step 5: Solve for x
   x = 82,792,955.95/14,259.09
6. Step 6: Final answer
   x = 5,806.33