Finding the Fourth Proportional to 9,345.39, 12,897.72 and 5,365.05

Step by Step Solution

1. Step 1: Write the proportion equation
   9,345.39 : 12,897.72 = 5,365.05 : x
2. Step 2: Convert to fraction form
   9,345.39/12,897.72 = 5,365.05/x
3. Step 3: Cross multiply
   9,345.39x = 12,897.72 × 5,365.05
4. Step 4: Simplify right side
   9,345.39x = 69,196,912.69
5. Step 5: Solve for x
   x = 69,196,912.69/9,345.39
6. Step 6: Final answer
   x = 7,404.39