Finding the Fourth Proportional to 6,087.30, 9,116.55 and 4,128.90

Step by Step Solution

1. Step 1: Write the proportion equation
   6,087.30 : 9,116.55 = 4,128.90 : x
2. Step 2: Convert to fraction form
   6,087.30/9,116.55 = 4,128.90/x
3. Step 3: Cross multiply
   6,087.30x = 9,116.55 × 4,128.90
4. Step 4: Simplify right side
   6,087.30x = 37,641,323.30
5. Step 5: Solve for x
   x = 37,641,323.30/6,087.30
6. Step 6: Final answer
   x = 6,183.58