Finding the Fourth Proportional to 2,114.69, 2,918.42 and 1,218.74

Step by Step Solution

1. Step 1: Write the proportion equation
   2,114.69 : 2,918.42 = 1,218.74 : x
2. Step 2: Convert to fraction form
   2,114.69/2,918.42 = 1,218.74/x
3. Step 3: Cross multiply
   2,114.69x = 2,918.42 × 1,218.74
4. Step 4: Simplify right side
   2,114.69x = 3,556,774.51
5. Step 5: Solve for x
   x = 3,556,774.51/2,114.69
6. Step 6: Final answer
   x = 1,681.94