Finding the Fourth Proportional to 9,321.70, 12,863.57 and 5,340.05

Step by Step Solution

1. Step 1: Write the proportion equation
   9,321.70 : 12,863.57 = 5,340.05 : x
2. Step 2: Convert to fraction form
   9,321.70/12,863.57 = 5,340.05/x
3. Step 3: Cross multiply
   9,321.70x = 12,863.57 × 5,340.05
4. Step 4: Simplify right side
   9,321.70x = 68,692,106.98
5. Step 5: Solve for x
   x = 68,692,106.98/9,321.70
6. Step 6: Final answer
   x = 7,369.05