Finding the Fourth Proportional to 1,085.63, 1,626.85 and 928.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.63 : 1,626.85 = 928.53 : x
2. Step 2: Convert to fraction form
   1,085.63/1,626.85 = 928.53/x
3. Step 3: Cross multiply
   1,085.63x = 1,626.85 × 928.53
4. Step 4: Simplify right side
   1,085.63x = 1,510,569.41
5. Step 5: Solve for x
   x = 1,510,569.41/1,085.63
6. Step 6: Final answer
   x = 1,391.42