Finding the Fourth Proportional to 1,445.68, 1,994.59 and 885.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,445.68 : 1,994.59 = 885.57 : x
2. Step 2: Convert to fraction form
   1,445.68/1,994.59 = 885.57/x
3. Step 3: Cross multiply
   1,445.68x = 1,994.59 × 885.57
4. Step 4: Simplify right side
   1,445.68x = 1,766,334.67
5. Step 5: Solve for x
   x = 1,766,334.67/1,445.68
6. Step 6: Final answer
   x = 1,221.80