Finding the Fourth Proportional to 9,191.08, 12,684.72 and 8,628.04

Step by Step Solution

1. Step 1: Write the proportion equation
   9,191.08 : 12,684.72 = 8,628.04 : x
2. Step 2: Convert to fraction form
   9,191.08/12,684.72 = 8,628.04/x
3. Step 3: Cross multiply
   9,191.08x = 12,684.72 × 8,628.04
4. Step 4: Simplify right side
   9,191.08x = 109,444,271.55
5. Step 5: Solve for x
   x = 109,444,271.55/9,191.08
6. Step 6: Final answer
   x = 11,907.66