Finding the Fourth Proportional to 9,399.89, 12,971.85 and 5,623.22

Step by Step Solution

1. Step 1: Write the proportion equation
   9,399.89 : 12,971.85 = 5,623.22 : x
2. Step 2: Convert to fraction form
   9,399.89/12,971.85 = 5,623.22/x
3. Step 3: Cross multiply
   9,399.89x = 12,971.85 × 5,623.22
4. Step 4: Simplify right side
   9,399.89x = 72,943,522.58
5. Step 5: Solve for x
   x = 72,943,522.58/9,399.89
6. Step 6: Final answer
   x = 7,760.04