Finding the Fourth Proportional to 13,086.56, 19,627.90 and 4,321.55

Step by Step Solution

1. Step 1: Write the proportion equation
   13,086.56 : 19,627.90 = 4,321.55 : x
2. Step 2: Convert to fraction form
   13,086.56/19,627.90 = 4,321.55/x
3. Step 3: Cross multiply
   13,086.56x = 19,627.90 × 4,321.55
4. Step 4: Simplify right side
   13,086.56x = 84,822,951.25
5. Step 5: Solve for x
   x = 84,822,951.25/13,086.56
6. Step 6: Final answer
   x = 6,481.68