Finding the Fourth Proportional to 13,086.06, 19,629.72 and 4,320.78

Step by Step Solution

1. Step 1: Write the proportion equation
   13,086.06 : 19,629.72 = 4,320.78 : x
2. Step 2: Convert to fraction form
   13,086.06/19,629.72 = 4,320.78/x
3. Step 3: Cross multiply
   13,086.06x = 19,629.72 × 4,320.78
4. Step 4: Simplify right side
   13,086.06x = 84,815,701.58
5. Step 5: Solve for x
   x = 84,815,701.58/13,086.06
6. Step 6: Final answer
   x = 6,481.38