Finding the Fourth Proportional to 2,012.75, 3,015.37 and 1,188.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,012.75 : 3,015.37 = 1,188.57 : x
2. Step 2: Convert to fraction form
   2,012.75/3,015.37 = 1,188.57/x
3. Step 3: Cross multiply
   2,012.75x = 3,015.37 × 1,188.57
4. Step 4: Simplify right side
   2,012.75x = 3,583,978.32
5. Step 5: Solve for x
   x = 3,583,978.32/2,012.75
6. Step 6: Final answer
   x = 1,780.64