Finding the Fourth Proportional to 2,805.57, 4,207.59 and 1,161.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,805.57 : 4,207.59 = 1,161.72 : x
2. Step 2: Convert to fraction form
   2,805.57/4,207.59 = 1,161.72/x
3. Step 3: Cross multiply
   2,805.57x = 4,207.59 × 1,161.72
4. Step 4: Simplify right side
   2,805.57x = 4,888,041.45
5. Step 5: Solve for x
   x = 4,888,041.45/2,805.57
6. Step 6: Final answer
   x = 1,742.26