Finding the Fourth Proportional to 1,291.72, 1,781.25 and 1,105.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,291.72 : 1,781.25 = 1,105.84 : x
2. Step 2: Convert to fraction form
   1,291.72/1,781.25 = 1,105.84/x
3. Step 3: Cross multiply
   1,291.72x = 1,781.25 × 1,105.84
4. Step 4: Simplify right side
   1,291.72x = 1,969,777.50
5. Step 5: Solve for x
   x = 1,969,777.50/1,291.72
6. Step 6: Final answer
   x = 1,524.93