Finding the Fourth Proportional to 3,187.88, 4,780.31 and 1,185.18

Step by Step Solution

1. Step 1: Write the proportion equation
   3,187.88 : 4,780.31 = 1,185.18 : x
2. Step 2: Convert to fraction form
   3,187.88/4,780.31 = 1,185.18/x
3. Step 3: Cross multiply
   3,187.88x = 4,780.31 × 1,185.18
4. Step 4: Simplify right side
   3,187.88x = 5,665,521.88
5. Step 5: Solve for x
   x = 5,665,521.88/3,187.88
6. Step 6: Final answer
   x = 1,777.21