Finding the Fourth Proportional to 2,112.69, 3,169.50 and 725.99

Step by Step Solution

1. Step 1: Write the proportion equation
   2,112.69 : 3,169.50 = 725.99 : x
2. Step 2: Convert to fraction form
   2,112.69/3,169.50 = 725.99/x
3. Step 3: Cross multiply
   2,112.69x = 3,169.50 × 725.99
4. Step 4: Simplify right side
   2,112.69x = 2,301,025.31
5. Step 5: Solve for x
   x = 2,301,025.31/2,112.69
6. Step 6: Final answer
   x = 1,089.14