Finding the Fourth Proportional to 8,321.94, 12,486.27 and 3,128.22

Step by Step Solution

1. Step 1: Write the proportion equation
   8,321.94 : 12,486.27 = 3,128.22 : x
2. Step 2: Convert to fraction form
   8,321.94/12,486.27 = 3,128.22/x
3. Step 3: Cross multiply
   8,321.94x = 12,486.27 × 3,128.22
4. Step 4: Simplify right side
   8,321.94x = 39,059,799.54
5. Step 5: Solve for x
   x = 39,059,799.54/8,321.94
6. Step 6: Final answer
   x = 4,693.59