Finding the Fourth Proportional to 3,111.91, 4,667.12 and 890.67

Step by Step Solution

1. Step 1: Write the proportion equation
   3,111.91 : 4,667.12 = 890.67 : x
2. Step 2: Convert to fraction form
   3,111.91/4,667.12 = 890.67/x
3. Step 3: Cross multiply
   3,111.91x = 4,667.12 × 890.67
4. Step 4: Simplify right side
   3,111.91x = 4,156,866.00
5. Step 5: Solve for x
   x = 4,156,866.00/3,111.91
6. Step 6: Final answer
   x = 1,335.79