Finding the Fourth Proportional to 1,395.15, 1,927.56 and 1,187.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,395.15 : 1,927.56 = 1,187.52 : x
2. Step 2: Convert to fraction form
   1,395.15/1,927.56 = 1,187.52/x
3. Step 3: Cross multiply
   1,395.15x = 1,927.56 × 1,187.52
4. Step 4: Simplify right side
   1,395.15x = 2,289,016.05
5. Step 5: Solve for x
   x = 2,289,016.05/1,395.15
6. Step 6: Final answer
   x = 1,640.70