Finding the Fourth Proportional to 13,429.72, 18,533.94 and 7,765.48

Step by Step Solution

1. Step 1: Write the proportion equation
   13,429.72 : 18,533.94 = 7,765.48 : x
2. Step 2: Convert to fraction form
   13,429.72/18,533.94 = 7,765.48/x
3. Step 3: Cross multiply
   13,429.72x = 18,533.94 × 7,765.48
4. Step 4: Simplify right side
   13,429.72x = 143,924,940.39
5. Step 5: Solve for x
   x = 143,924,940.39/13,429.72
6. Step 6: Final answer
   x = 10,716.90