Finding the Fourth Proportional to 1,445.79, 1,994.55 and 855.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,445.79 : 1,994.55 = 855.99 : x
2. Step 2: Convert to fraction form
   1,445.79/1,994.55 = 855.99/x
3. Step 3: Cross multiply
   1,445.79x = 1,994.55 × 855.99
4. Step 4: Simplify right side
   1,445.79x = 1,707,311.64
5. Step 5: Solve for x
   x = 1,707,311.64/1,445.79
6. Step 6: Final answer
   x = 1,180.88