Finding the Fourth Proportional to 2,233.79, 3,082.80 and 1,289.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,233.79 : 3,082.80 = 1,289.91 : x
2. Step 2: Convert to fraction form
   2,233.79/3,082.80 = 1,289.91/x
3. Step 3: Cross multiply
   2,233.79x = 3,082.80 × 1,289.91
4. Step 4: Simplify right side
   2,233.79x = 3,976,534.55
5. Step 5: Solve for x
   x = 3,976,534.55/2,233.79
6. Step 6: Final answer
   x = 1,780.17