Finding the Fourth Proportional to 21,756.94, 30,024.54 and 13,259.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,756.94 : 30,024.54 = 13,259.10 : x
2. Step 2: Convert to fraction form
   21,756.94/30,024.54 = 13,259.10/x
3. Step 3: Cross multiply
   21,756.94x = 30,024.54 × 13,259.10
4. Step 4: Simplify right side
   21,756.94x = 398,098,378.31
5. Step 5: Solve for x
   x = 398,098,378.31/21,756.94
6. Step 6: Final answer
   x = 18,297.54