Finding the Fourth Proportional to 2,081.74, 3,120.54 and 1,157.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,081.74 : 3,120.54 = 1,157.72 : x
2. Step 2: Convert to fraction form
   2,081.74/3,120.54 = 1,157.72/x
3. Step 3: Cross multiply
   2,081.74x = 3,120.54 × 1,157.72
4. Step 4: Simplify right side
   2,081.74x = 3,612,711.57
5. Step 5: Solve for x
   x = 3,612,711.57/2,081.74
6. Step 6: Final answer
   x = 1,735.43