Finding the Fourth Proportional to 9,321.34, 12,863.50 and 5,072.43

Step by Step Solution

1. Step 1: Write the proportion equation
   9,321.34 : 12,863.50 = 5,072.43 : x
2. Step 2: Convert to fraction form
   9,321.34/12,863.50 = 5,072.43/x
3. Step 3: Cross multiply
   9,321.34x = 12,863.50 × 5,072.43
4. Step 4: Simplify right side
   9,321.34x = 65,249,267.39
5. Step 5: Solve for x
   x = 65,249,267.39/9,321.34
6. Step 6: Final answer
   x = 6,999.99