Finding the Fourth Proportional to 13,393.82, 18,483.33 and 7,728.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,393.82 : 18,483.33 = 7,728.50 : x
2. Step 2: Convert to fraction form
   13,393.82/18,483.33 = 7,728.50/x
3. Step 3: Cross multiply
   13,393.82x = 18,483.33 × 7,728.50
4. Step 4: Simplify right side
   13,393.82x = 142,848,377.26
5. Step 5: Solve for x
   x = 142,848,377.26/13,393.82
6. Step 6: Final answer
   x = 10,665.25