Finding the Fourth Proportional to 1,890.96, 2,609.54 and 1,105.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,890.96 : 2,609.54 = 1,105.40 : x
2. Step 2: Convert to fraction form
   1,890.96/2,609.54 = 1,105.40/x
3. Step 3: Cross multiply
   1,890.96x = 2,609.54 × 1,105.40
4. Step 4: Simplify right side
   1,890.96x = 2,884,585.52
5. Step 5: Solve for x
   x = 2,884,585.52/1,890.96
6. Step 6: Final answer
   x = 1,525.46