Finding the Fourth Proportional to 8,109.16, 12,156.42 and 4,201.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,109.16 : 12,156.42 = 4,201.72 : x
2. Step 2: Convert to fraction form
   8,109.16/12,156.42 = 4,201.72/x
3. Step 3: Cross multiply
   8,109.16x = 12,156.42 × 4,201.72
4. Step 4: Simplify right side
   8,109.16x = 51,077,873.04
5. Step 5: Solve for x
   x = 51,077,873.04/8,109.16
6. Step 6: Final answer
   x = 6,298.79