Finding the Fourth Proportional to 21,759.13, 30,025.35 and 12,806.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,759.13 : 30,025.35 = 12,806.10 : x
2. Step 2: Convert to fraction form
   21,759.13/30,025.35 = 12,806.10/x
3. Step 3: Cross multiply
   21,759.13x = 30,025.35 × 12,806.10
4. Step 4: Simplify right side
   21,759.13x = 384,507,580.61
5. Step 5: Solve for x
   x = 384,507,580.61/21,759.13
6. Step 6: Final answer
   x = 17,671.09