Finding the Fourth Proportional to 11,647.72, 16,071.42 and 6,931.18

Step by Step Solution

1. Step 1: Write the proportion equation
   11,647.72 : 16,071.42 = 6,931.18 : x
2. Step 2: Convert to fraction form
   11,647.72/16,071.42 = 6,931.18/x
3. Step 3: Cross multiply
   11,647.72x = 16,071.42 × 6,931.18
4. Step 4: Simplify right side
   11,647.72x = 111,393,904.88
5. Step 5: Solve for x
   x = 111,393,904.88/11,647.72
6. Step 6: Final answer
   x = 9,563.58