Finding the Fourth Proportional to 1,112.92, 1,667.54 and 786.68

Step by Step Solution

1. Step 1: Write the proportion equation
   1,112.92 : 1,667.54 = 786.68 : x
2. Step 2: Convert to fraction form
   1,112.92/1,667.54 = 786.68/x
3. Step 3: Cross multiply
   1,112.92x = 1,667.54 × 786.68
4. Step 4: Simplify right side
   1,112.92x = 1,311,820.37
5. Step 5: Solve for x
   x = 1,311,820.37/1,112.92
6. Step 6: Final answer
   x = 1,178.72