Finding the Fourth Proportional to 9,603.42, 13,253.67 and 5,355.15

Step by Step Solution

1. Step 1: Write the proportion equation
   9,603.42 : 13,253.67 = 5,355.15 : x
2. Step 2: Convert to fraction form
   9,603.42/13,253.67 = 5,355.15/x
3. Step 3: Cross multiply
   9,603.42x = 13,253.67 × 5,355.15
4. Step 4: Simplify right side
   9,603.42x = 70,975,390.90
5. Step 5: Solve for x
   x = 70,975,390.90/9,603.42
6. Step 6: Final answer
   x = 7,390.64