Finding the Fourth Proportional to 8,118.72, 12,174.60 and 3,187.56

Step by Step Solution

1. Step 1: Write the proportion equation
   8,118.72 : 12,174.60 = 3,187.56 : x
2. Step 2: Convert to fraction form
   8,118.72/12,174.60 = 3,187.56/x
3. Step 3: Cross multiply
   8,118.72x = 12,174.60 × 3,187.56
4. Step 4: Simplify right side
   8,118.72x = 38,807,267.98
5. Step 5: Solve for x
   x = 38,807,267.98/8,118.72
6. Step 6: Final answer
   x = 4,779.97