Finding the Fourth Proportional to 2,085.04, 3,123.42 and 1,389.64

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.04 : 3,123.42 = 1,389.64 : x
2. Step 2: Convert to fraction form
   2,085.04/3,123.42 = 1,389.64/x
3. Step 3: Cross multiply
   2,085.04x = 3,123.42 × 1,389.64
4. Step 4: Simplify right side
   2,085.04x = 4,340,429.37
5. Step 5: Solve for x
   x = 4,340,429.37/2,085.04
6. Step 6: Final answer
   x = 2,081.70