Finding the Fourth Proportional to 1,381.60, 1,904.34 and 1,085.68

Step by Step Solution

1. Step 1: Write the proportion equation
   1,381.60 : 1,904.34 = 1,085.68 : x
2. Step 2: Convert to fraction form
   1,381.60/1,904.34 = 1,085.68/x
3. Step 3: Cross multiply
   1,381.60x = 1,904.34 × 1,085.68
4. Step 4: Simplify right side
   1,381.60x = 2,067,503.85
5. Step 5: Solve for x
   x = 2,067,503.85/1,381.60
6. Step 6: Final answer
   x = 1,496.46