Finding the Fourth Proportional to 2,918.72, 4,380.80 and 1,187.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,918.72 : 4,380.80 = 1,187.48 : x
2. Step 2: Convert to fraction form
   2,918.72/4,380.80 = 1,187.48/x
3. Step 3: Cross multiply
   2,918.72x = 4,380.80 × 1,187.48
4. Step 4: Simplify right side
   2,918.72x = 5,202,112.38
5. Step 5: Solve for x
   x = 5,202,112.38/2,918.72
6. Step 6: Final answer
   x = 1,782.33