Finding the Fourth Proportional to 9,321.35, 12,863.61 and 5,072.49

Step by Step Solution

1. Step 1: Write the proportion equation
   9,321.35 : 12,863.61 = 5,072.49 : x
2. Step 2: Convert to fraction form
   9,321.35/12,863.61 = 5,072.49/x
3. Step 3: Cross multiply
   9,321.35x = 12,863.61 × 5,072.49
4. Step 4: Simplify right side
   9,321.35x = 65,250,533.09
5. Step 5: Solve for x
   x = 65,250,533.09/9,321.35
6. Step 6: Final answer
   x = 7,000.12