Finding the Fourth Proportional to 9,150.72, 13,749.48 and 8,619.54

Step by Step Solution

1. Step 1: Write the proportion equation
   9,150.72 : 13,749.48 = 8,619.54 : x
2. Step 2: Convert to fraction form
   9,150.72/13,749.48 = 8,619.54/x
3. Step 3: Cross multiply
   9,150.72x = 13,749.48 × 8,619.54
4. Step 4: Simplify right side
   9,150.72x = 118,514,192.84
5. Step 5: Solve for x
   x = 118,514,192.84/9,150.72
6. Step 6: Final answer
   x = 12,951.35