Finding the Fourth Proportional to 2,112.25, 3,167.01 and 1,139.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,112.25 : 3,167.01 = 1,139.05 : x
2. Step 2: Convert to fraction form
   2,112.25/3,167.01 = 1,139.05/x
3. Step 3: Cross multiply
   2,112.25x = 3,167.01 × 1,139.05
4. Step 4: Simplify right side
   2,112.25x = 3,607,382.74
5. Step 5: Solve for x
   x = 3,607,382.74/2,112.25
6. Step 6: Final answer
   x = 1,707.84