Finding the Fourth Proportional to 1,112.48, 1,667.50 and 786.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,112.48 : 1,667.50 = 786.86 : x
2. Step 2: Convert to fraction form
   1,112.48/1,667.50 = 786.86/x
3. Step 3: Cross multiply
   1,112.48x = 1,667.50 × 786.86
4. Step 4: Simplify right side
   1,112.48x = 1,312,078.75
5. Step 5: Solve for x
   x = 1,312,078.75/1,112.48
6. Step 6: Final answer
   x = 1,179.42