Finding the Fourth Proportional to 11,817.21, 17,728.89 and 4,422.25

Step by Step Solution

1. Step 1: Write the proportion equation
   11,817.21 : 17,728.89 = 4,422.25 : x
2. Step 2: Convert to fraction form
   11,817.21/17,728.89 = 4,422.25/x
3. Step 3: Cross multiply
   11,817.21x = 17,728.89 × 4,422.25
4. Step 4: Simplify right side
   11,817.21x = 78,401,583.80
5. Step 5: Solve for x
   x = 78,401,583.80/11,817.21
6. Step 6: Final answer
   x = 6,634.53