Finding the Fourth Proportional to 11,921.49, 17,881.49 and 5,345.51

Step by Step Solution

1. Step 1: Write the proportion equation
   11,921.49 : 17,881.49 = 5,345.51 : x
2. Step 2: Convert to fraction form
   11,921.49/17,881.49 = 5,345.51/x
3. Step 3: Cross multiply
   11,921.49x = 17,881.49 × 5,345.51
4. Step 4: Simplify right side
   11,921.49x = 95,585,607.57
5. Step 5: Solve for x
   x = 95,585,607.57/11,921.49
6. Step 6: Final answer
   x = 8,017.92