Finding the Fourth Proportional to 1,396.74, 1,928.20 and 1,081.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,396.74 : 1,928.20 = 1,081.30 : x
2. Step 2: Convert to fraction form
   1,396.74/1,928.20 = 1,081.30/x
3. Step 3: Cross multiply
   1,396.74x = 1,928.20 × 1,081.30
4. Step 4: Simplify right side
   1,396.74x = 2,084,962.66
5. Step 5: Solve for x
   x = 2,084,962.66/1,396.74
6. Step 6: Final answer
   x = 1,492.73