Finding the Fourth Proportional to 1,389.17, 2,090.43 and 1,144.14

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.17 : 2,090.43 = 1,144.14 : x
2. Step 2: Convert to fraction form
   1,389.17/2,090.43 = 1,144.14/x
3. Step 3: Cross multiply
   1,389.17x = 2,090.43 × 1,144.14
4. Step 4: Simplify right side
   1,389.17x = 2,391,744.58
5. Step 5: Solve for x
   x = 2,391,744.58/1,389.17
6. Step 6: Final answer
   x = 1,721.71