Finding the Fourth Proportional to 9,321.22, 12,863.03 and 5,072.18

Step by Step Solution

1. Step 1: Write the proportion equation
   9,321.22 : 12,863.03 = 5,072.18 : x
2. Step 2: Convert to fraction form
   9,321.22/12,863.03 = 5,072.18/x
3. Step 3: Cross multiply
   9,321.22x = 12,863.03 × 5,072.18
4. Step 4: Simplify right side
   9,321.22x = 65,243,610.30
5. Step 5: Solve for x
   x = 65,243,610.30/9,321.22
6. Step 6: Final answer
   x = 6,999.47