Finding the Fourth Proportional to 9,128.29, 13,681.50 and 5,422.54

Step by Step Solution

1. Step 1: Write the proportion equation
   9,128.29 : 13,681.50 = 5,422.54 : x
2. Step 2: Convert to fraction form
   9,128.29/13,681.50 = 5,422.54/x
3. Step 3: Cross multiply
   9,128.29x = 13,681.50 × 5,422.54
4. Step 4: Simplify right side
   9,128.29x = 74,188,481.01
5. Step 5: Solve for x
   x = 74,188,481.01/9,128.29
6. Step 6: Final answer
   x = 8,127.31