Finding the Fourth Proportional to 1,085.19, 1,629.41 and 623.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.19 : 1,629.41 = 623.49 : x
2. Step 2: Convert to fraction form
   1,085.19/1,629.41 = 623.49/x
3. Step 3: Cross multiply
   1,085.19x = 1,629.41 × 623.49
4. Step 4: Simplify right side
   1,085.19x = 1,015,917.72
5. Step 5: Solve for x
   x = 1,015,917.72/1,085.19
6. Step 6: Final answer
   x = 936.17