Finding the Fourth Proportional to 1,380.81, 1,906.26 and 1,081.44

Step by Step Solution

1. Step 1: Write the proportion equation
   1,380.81 : 1,906.26 = 1,081.44 : x
2. Step 2: Convert to fraction form
   1,380.81/1,906.26 = 1,081.44/x
3. Step 3: Cross multiply
   1,380.81x = 1,906.26 × 1,081.44
4. Step 4: Simplify right side
   1,380.81x = 2,061,505.81
5. Step 5: Solve for x
   x = 2,061,505.81/1,380.81
6. Step 6: Final answer
   x = 1,492.97