Finding the Fourth Proportional to 11,863.12, 16,368.78 and 7,147.72

Step by Step Solution

1. Step 1: Write the proportion equation
   11,863.12 : 16,368.78 = 7,147.72 : x
2. Step 2: Convert to fraction form
   11,863.12/16,368.78 = 7,147.72/x
3. Step 3: Cross multiply
   11,863.12x = 16,368.78 × 7,147.72
4. Step 4: Simplify right side
   11,863.12x = 116,999,456.18
5. Step 5: Solve for x
   x = 116,999,456.18/11,863.12
6. Step 6: Final answer
   x = 9,862.45