Finding the Fourth Proportional to 6,291.18, 8,680.86 and 3,638.08

Step by Step Solution

1. Step 1: Write the proportion equation
   6,291.18 : 8,680.86 = 3,638.08 : x
2. Step 2: Convert to fraction form
   6,291.18/8,680.86 = 3,638.08/x
3. Step 3: Cross multiply
   6,291.18x = 8,680.86 × 3,638.08
4. Step 4: Simplify right side
   6,291.18x = 31,581,674.00
5. Step 5: Solve for x
   x = 31,581,674.00/6,291.18
6. Step 6: Final answer
   x = 5,019.99