Finding the Fourth Proportional to 2,667.80, 3,999.26 and 1,186.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,667.80 : 3,999.26 = 1,186.25 : x
2. Step 2: Convert to fraction form
   2,667.80/3,999.26 = 1,186.25/x
3. Step 3: Cross multiply
   2,667.80x = 3,999.26 × 1,186.25
4. Step 4: Simplify right side
   2,667.80x = 4,744,105.14
5. Step 5: Solve for x
   x = 4,744,105.14/2,667.80
6. Step 6: Final answer
   x = 1,778.28