Finding the Fourth Proportional to 1,085.06, 1,623.54 and 667.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.06 : 1,623.54 = 667.10 : x
2. Step 2: Convert to fraction form
   1,085.06/1,623.54 = 667.10/x
3. Step 3: Cross multiply
   1,085.06x = 1,623.54 × 667.10
4. Step 4: Simplify right side
   1,085.06x = 1,083,063.53
5. Step 5: Solve for x
   x = 1,083,063.53/1,085.06
6. Step 6: Final answer
   x = 998.16