Finding the Fourth Proportional to 9,128.47, 12,597.38 and 5,353.87

Step by Step Solution

1. Step 1: Write the proportion equation
   9,128.47 : 12,597.38 = 5,353.87 : x
2. Step 2: Convert to fraction form
   9,128.47/12,597.38 = 5,353.87/x
3. Step 3: Cross multiply
   9,128.47x = 12,597.38 × 5,353.87
4. Step 4: Simplify right side
   9,128.47x = 67,444,734.86
5. Step 5: Solve for x
   x = 67,444,734.86/9,128.47
6. Step 6: Final answer
   x = 7,388.39