Finding the Fourth Proportional to 2,085.68, 3,128.46 and 1,393.67

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.68 : 3,128.46 = 1,393.67 : x
2. Step 2: Convert to fraction form
   2,085.68/3,128.46 = 1,393.67/x
3. Step 3: Cross multiply
   2,085.68x = 3,128.46 × 1,393.67
4. Step 4: Simplify right side
   2,085.68x = 4,360,043.44
5. Step 5: Solve for x
   x = 4,360,043.44/2,085.68
6. Step 6: Final answer
   x = 2,090.46