Finding the Fourth Proportional to 10,128.69, 15,194.88 and 3,555.54

Step by Step Solution

1. Step 1: Write the proportion equation
   10,128.69 : 15,194.88 = 3,555.54 : x
2. Step 2: Convert to fraction form
   10,128.69/15,194.88 = 3,555.54/x
3. Step 3: Cross multiply
   10,128.69x = 15,194.88 × 3,555.54
4. Step 4: Simplify right side
   10,128.69x = 54,026,003.64
5. Step 5: Solve for x
   x = 54,026,003.64/10,128.69
6. Step 6: Final answer
   x = 5,333.96