Finding the Fourth Proportional to 1,389.34, 2,080.38 and 1,110.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.34 : 2,080.38 = 1,110.42 : x
2. Step 2: Convert to fraction form
   1,389.34/2,080.38 = 1,110.42/x
3. Step 3: Cross multiply
   1,389.34x = 2,080.38 × 1,110.42
4. Step 4: Simplify right side
   1,389.34x = 2,310,089.48
5. Step 5: Solve for x
   x = 2,310,089.48/1,389.34
6. Step 6: Final answer
   x = 1,662.72