Finding the Fourth Proportional to 2,112.30, 3,164.99 and 724.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,112.30 : 3,164.99 = 724.89 : x
2. Step 2: Convert to fraction form
   2,112.30/3,164.99 = 724.89/x
3. Step 3: Cross multiply
   2,112.30x = 3,164.99 × 724.89
4. Step 4: Simplify right side
   2,112.30x = 2,294,269.60
5. Step 5: Solve for x
   x = 2,294,269.60/2,112.30
6. Step 6: Final answer
   x = 1,086.15