Finding the Fourth Proportional to 10,128.28, 15,186.75 and 3,551.89

Step by Step Solution

1. Step 1: Write the proportion equation
   10,128.28 : 15,186.75 = 3,551.89 : x
2. Step 2: Convert to fraction form
   10,128.28/15,186.75 = 3,551.89/x
3. Step 3: Cross multiply
   10,128.28x = 15,186.75 × 3,551.89
4. Step 4: Simplify right side
   10,128.28x = 53,941,665.46
5. Step 5: Solve for x
   x = 53,941,665.46/10,128.28
6. Step 6: Final answer
   x = 5,325.85