Finding the Fourth Proportional to 2,187.35, 3,018.81 and 1,380.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,187.35 : 3,018.81 = 1,380.98 : x
2. Step 2: Convert to fraction form
   2,187.35/3,018.81 = 1,380.98/x
3. Step 3: Cross multiply
   2,187.35x = 3,018.81 × 1,380.98
4. Step 4: Simplify right side
   2,187.35x = 4,168,919.54
5. Step 5: Solve for x
   x = 4,168,919.54/2,187.35
6. Step 6: Final answer
   x = 1,905.92