Finding the Fourth Proportional to 11,919.72, 17,866.62 and 4,986.12

Step by Step Solution

1. Step 1: Write the proportion equation
   11,919.72 : 17,866.62 = 4,986.12 : x
2. Step 2: Convert to fraction form
   11,919.72/17,866.62 = 4,986.12/x
3. Step 3: Cross multiply
   11,919.72x = 17,866.62 × 4,986.12
4. Step 4: Simplify right side
   11,919.72x = 89,085,111.31
5. Step 5: Solve for x
   x = 89,085,111.31/11,919.72
6. Step 6: Final answer
   x = 7,473.76