Finding the Fourth Proportional to 13,147.68, 18,144.18 and 7,842.36

Step by Step Solution

1. Step 1: Write the proportion equation
   13,147.68 : 18,144.18 = 7,842.36 : x
2. Step 2: Convert to fraction form
   13,147.68/18,144.18 = 7,842.36/x
3. Step 3: Cross multiply
   13,147.68x = 18,144.18 × 7,842.36
4. Step 4: Simplify right side
   13,147.68x = 142,293,191.46
5. Step 5: Solve for x
   x = 142,293,191.46/13,147.68
6. Step 6: Final answer
   x = 10,822.68