Finding the Fourth Proportional to 8,173.59, 12,257.95 and 2,978.25

Step by Step Solution

1. Step 1: Write the proportion equation
   8,173.59 : 12,257.95 = 2,978.25 : x
2. Step 2: Convert to fraction form
   8,173.59/12,257.95 = 2,978.25/x
3. Step 3: Cross multiply
   8,173.59x = 12,257.95 × 2,978.25
4. Step 4: Simplify right side
   8,173.59x = 36,507,239.59
5. Step 5: Solve for x
   x = 36,507,239.59/8,173.59
6. Step 6: Final answer
   x = 4,466.49