Finding the Fourth Proportional to 1,891.42, 2,609.72 and 1,105.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,891.42 : 2,609.72 = 1,105.72 : x
2. Step 2: Convert to fraction form
   1,891.42/2,609.72 = 1,105.72/x
3. Step 3: Cross multiply
   1,891.42x = 2,609.72 × 1,105.72
4. Step 4: Simplify right side
   1,891.42x = 2,885,611.69
5. Step 5: Solve for x
   x = 2,885,611.69/1,891.42
6. Step 6: Final answer
   x = 1,525.63