Finding the Fourth Proportional to 1,111.27, 1,667.00 and 289.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.27 : 1,667.00 = 289.55 : x
2. Step 2: Convert to fraction form
   1,111.27/1,667.00 = 289.55/x
3. Step 3: Cross multiply
   1,111.27x = 1,667.00 × 289.55
4. Step 4: Simplify right side
   1,111.27x = 482,672.24
5. Step 5: Solve for x
   x = 482,672.24/1,111.27
6. Step 6: Final answer
   x = 434.34