Finding the Fourth Proportional to 2,112.47, 3,167.89 and 725.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,112.47 : 3,167.89 = 725.55 : x
2. Step 2: Convert to fraction form
   2,112.47/3,167.89 = 725.55/x
3. Step 3: Cross multiply
   2,112.47x = 3,167.89 × 725.55
4. Step 4: Simplify right side
   2,112.47x = 2,298,451.62
5. Step 5: Solve for x
   x = 2,298,451.62/2,112.47
6. Step 6: Final answer
   x = 1,088.04