Finding the Fourth Proportional to 2,118.42, 3,178.99 and 1,145.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,118.42 : 3,178.99 = 1,145.22 : x
2. Step 2: Convert to fraction form
   2,118.42/3,178.99 = 1,145.22/x
3. Step 3: Cross multiply
   2,118.42x = 3,178.99 × 1,145.22
4. Step 4: Simplify right side
   2,118.42x = 3,640,642.93
5. Step 5: Solve for x
   x = 3,640,642.93/2,118.42
6. Step 6: Final answer
   x = 1,718.57