Finding the Fourth Proportional to 8,111.59, 12,162.47 and 3,947.40

Step by Step Solution

1. Step 1: Write the proportion equation
   8,111.59 : 12,162.47 = 3,947.40 : x
2. Step 2: Convert to fraction form
   8,111.59/12,162.47 = 3,947.40/x
3. Step 3: Cross multiply
   8,111.59x = 12,162.47 × 3,947.40
4. Step 4: Simplify right side
   8,111.59x = 48,010,114.34
5. Step 5: Solve for x
   x = 48,010,114.34/8,111.59
6. Step 6: Final answer
   x = 5,918.71