Finding the Fourth Proportional to 13,147.16, 18,145.42 and 7,769.37

Step by Step Solution

1. Step 1: Write the proportion equation
   13,147.16 : 18,145.42 = 7,769.37 : x
2. Step 2: Convert to fraction form
   13,147.16/18,145.42 = 7,769.37/x
3. Step 3: Cross multiply
   13,147.16x = 18,145.42 × 7,769.37
4. Step 4: Simplify right side
   13,147.16x = 140,978,394.32
5. Step 5: Solve for x
   x = 140,978,394.32/13,147.16
6. Step 6: Final answer
   x = 10,723.11