Finding the Fourth Proportional to 1,112.91, 1,667.67 and 880.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,112.91 : 1,667.67 = 880.83 : x
2. Step 2: Convert to fraction form
   1,112.91/1,667.67 = 880.83/x
3. Step 3: Cross multiply
   1,112.91x = 1,667.67 × 880.83
4. Step 4: Simplify right side
   1,112.91x = 1,468,933.77
5. Step 5: Solve for x
   x = 1,468,933.77/1,112.91
6. Step 6: Final answer
   x = 1,319.90