Finding the Fourth Proportional to 1,445.18, 1,993.89 and 885.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,445.18 : 1,993.89 = 885.06 : x
2. Step 2: Convert to fraction form
   1,445.18/1,993.89 = 885.06/x
3. Step 3: Cross multiply
   1,445.18x = 1,993.89 × 885.06
4. Step 4: Simplify right side
   1,445.18x = 1,764,712.28
5. Step 5: Solve for x
   x = 1,764,712.28/1,445.18
6. Step 6: Final answer
   x = 1,221.11