Finding the Fourth Proportional to 1,085.46, 1,625.40 and 673.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.46 : 1,625.40 = 673.98 : x
2. Step 2: Convert to fraction form
   1,085.46/1,625.40 = 673.98/x
3. Step 3: Cross multiply
   1,085.46x = 1,625.40 × 673.98
4. Step 4: Simplify right side
   1,085.46x = 1,095,487.09
5. Step 5: Solve for x
   x = 1,095,487.09/1,085.46
6. Step 6: Final answer
   x = 1,009.24