Finding the Fourth Proportional to 11,742.84, 17,618.45 and 5,168.21

Step by Step Solution

1. Step 1: Write the proportion equation
   11,742.84 : 17,618.45 = 5,168.21 : x
2. Step 2: Convert to fraction form
   11,742.84/17,618.45 = 5,168.21/x
3. Step 3: Cross multiply
   11,742.84x = 17,618.45 × 5,168.21
4. Step 4: Simplify right side
   11,742.84x = 91,055,735.54
5. Step 5: Solve for x
   x = 91,055,735.54/11,742.84
6. Step 6: Final answer
   x = 7,754.15