Finding the Fourth Proportional to 8,112.83, 12,169.31 and 2,918.70

Step by Step Solution

1. Step 1: Write the proportion equation
   8,112.83 : 12,169.31 = 2,918.70 : x
2. Step 2: Convert to fraction form
   8,112.83/12,169.31 = 2,918.70/x
3. Step 3: Cross multiply
   8,112.83x = 12,169.31 × 2,918.70
4. Step 4: Simplify right side
   8,112.83x = 35,518,550.50
5. Step 5: Solve for x
   x = 35,518,550.50/8,112.83
6. Step 6: Final answer
   x = 4,378.07