Finding the Fourth Proportional to 2,213.90, 3,321.42 and 1,118.24

Step by Step Solution

1. Step 1: Write the proportion equation
   2,213.90 : 3,321.42 = 1,118.24 : x
2. Step 2: Convert to fraction form
   2,213.90/3,321.42 = 1,118.24/x
3. Step 3: Cross multiply
   2,213.90x = 3,321.42 × 1,118.24
4. Step 4: Simplify right side
   2,213.90x = 3,714,144.70
5. Step 5: Solve for x
   x = 3,714,144.70/2,213.90
6. Step 6: Final answer
   x = 1,677.65