Finding the Fourth Proportional to 13,680.82, 18,879.54 and 7,393.20

Step by Step Solution

1. Step 1: Write the proportion equation
   13,680.82 : 18,879.54 = 7,393.20 : x
2. Step 2: Convert to fraction form
   13,680.82/18,879.54 = 7,393.20/x
3. Step 3: Cross multiply
   13,680.82x = 18,879.54 × 7,393.20
4. Step 4: Simplify right side
   13,680.82x = 139,580,083.76
5. Step 5: Solve for x
   x = 139,580,083.76/13,680.82
6. Step 6: Final answer
   x = 10,202.61