Finding the Fourth Proportional to 8,321.34, 12,478.55 and 3,387.63

Step by Step Solution

1. Step 1: Write the proportion equation
   8,321.34 : 12,478.55 = 3,387.63 : x
2. Step 2: Convert to fraction form
   8,321.34/12,478.55 = 3,387.63/x
3. Step 3: Cross multiply
   8,321.34x = 12,478.55 × 3,387.63
4. Step 4: Simplify right side
   8,321.34x = 42,272,693.40
5. Step 5: Solve for x
   x = 42,272,693.40/8,321.34
6. Step 6: Final answer
   x = 5,080.03