Finding the Fourth Proportional to 2,187.10, 3,018.18 and 1,192.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,187.10 : 3,018.18 = 1,192.40 : x
2. Step 2: Convert to fraction form
   2,187.10/3,018.18 = 1,192.40/x
3. Step 3: Cross multiply
   2,187.10x = 3,018.18 × 1,192.40
4. Step 4: Simplify right side
   2,187.10x = 3,598,877.83
5. Step 5: Solve for x
   x = 3,598,877.83/2,187.10
6. Step 6: Final answer
   x = 1,645.50