Finding the Fourth Proportional to 2,118.62, 3,180.30 and 1,242.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,118.62 : 3,180.30 = 1,242.16 : x
2. Step 2: Convert to fraction form
   2,118.62/3,180.30 = 1,242.16/x
3. Step 3: Cross multiply
   2,118.62x = 3,180.30 × 1,242.16
4. Step 4: Simplify right side
   2,118.62x = 3,950,441.45
5. Step 5: Solve for x
   x = 3,950,441.45/2,118.62
6. Step 6: Final answer
   x = 1,864.63