Finding the Fourth Proportional to 2,112.12, 3,164.70 and 724.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,112.12 : 3,164.70 = 724.69 : x
2. Step 2: Convert to fraction form
   2,112.12/3,164.70 = 724.69/x
3. Step 3: Cross multiply
   2,112.12x = 3,164.70 × 724.69
4. Step 4: Simplify right side
   2,112.12x = 2,293,426.44
5. Step 5: Solve for x
   x = 2,293,426.44/2,112.12
6. Step 6: Final answer
   x = 1,085.84