Finding the Fourth Proportional to 1,381.58, 2,082.71 and 1,289.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,381.58 : 2,082.71 = 1,289.91 : x
2. Step 2: Convert to fraction form
   1,381.58/2,082.71 = 1,289.91/x
3. Step 3: Cross multiply
   1,381.58x = 2,082.71 × 1,289.91
4. Step 4: Simplify right side
   1,381.58x = 2,686,502.01
5. Step 5: Solve for x
   x = 2,686,502.01/1,381.58
6. Step 6: Final answer
   x = 1,944.52