Finding the Fourth Proportional to 9,321.10, 12,863.25 and 5,072.29

Step by Step Solution

1. Step 1: Write the proportion equation
   9,321.10 : 12,863.25 = 5,072.29 : x
2. Step 2: Convert to fraction form
   9,321.10/12,863.25 = 5,072.29/x
3. Step 3: Cross multiply
   9,321.10x = 12,863.25 × 5,072.29
4. Step 4: Simplify right side
   9,321.10x = 65,246,134.34
5. Step 5: Solve for x
   x = 65,246,134.34/9,321.10
6. Step 6: Final answer
   x = 6,999.83