Finding the Fourth Proportional to 8,321.22, 12,478.38 and 3,387.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,321.22 : 12,478.38 = 3,387.50 : x
2. Step 2: Convert to fraction form
   8,321.22/12,478.38 = 3,387.50/x
3. Step 3: Cross multiply
   8,321.22x = 12,478.38 × 3,387.50
4. Step 4: Simplify right side
   8,321.22x = 42,270,512.25
5. Step 5: Solve for x
   x = 42,270,512.25/8,321.22
6. Step 6: Final answer
   x = 5,079.85