Finding the Fourth Proportional to 9,815.47, 13,545.43 and 5,339.21

Step by Step Solution

1. Step 1: Write the proportion equation
   9,815.47 : 13,545.43 = 5,339.21 : x
2. Step 2: Convert to fraction form
   9,815.47/13,545.43 = 5,339.21/x
3. Step 3: Cross multiply
   9,815.47x = 13,545.43 × 5,339.21
4. Step 4: Simplify right side
   9,815.47x = 72,321,814.24
5. Step 5: Solve for x
   x = 72,321,814.24/9,815.47
6. Step 6: Final answer
   x = 7,368.15