Finding the Fourth Proportional to 1,134.06, 1,687.37 and 1,105.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,134.06 : 1,687.37 = 1,105.81 : x
2. Step 2: Convert to fraction form
   1,134.06/1,687.37 = 1,105.81/x
3. Step 3: Cross multiply
   1,134.06x = 1,687.37 × 1,105.81
4. Step 4: Simplify right side
   1,134.06x = 1,865,911.35
5. Step 5: Solve for x
   x = 1,865,911.35/1,134.06
6. Step 6: Final answer
   x = 1,645.34