Finding the Fourth Proportional to 9,128.28, 12,597.21 and 5,354.34

Step by Step Solution

1. Step 1: Write the proportion equation
   9,128.28 : 12,597.21 = 5,354.34 : x
2. Step 2: Convert to fraction form
   9,128.28/12,597.21 = 5,354.34/x
3. Step 3: Cross multiply
   9,128.28x = 12,597.21 × 5,354.34
4. Step 4: Simplify right side
   9,128.28x = 67,449,745.39
5. Step 5: Solve for x
   x = 67,449,745.39/9,128.28
6. Step 6: Final answer
   x = 7,389.10