Finding the Fourth Proportional to 8,572.96, 12,852.15 and 8,164.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,572.96 : 12,852.15 = 8,164.72 : x
2. Step 2: Convert to fraction form
   8,572.96/12,852.15 = 8,164.72/x
3. Step 3: Cross multiply
   8,572.96x = 12,852.15 × 8,164.72
4. Step 4: Simplify right side
   8,572.96x = 104,934,206.15
5. Step 5: Solve for x
   x = 104,934,206.15/8,572.96
6. Step 6: Final answer
   x = 12,240.14