Finding the Fourth Proportional to 1,445.09, 1,994.24 and 855.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,445.09 : 1,994.24 = 855.50 : x
2. Step 2: Convert to fraction form
   1,445.09/1,994.24 = 855.50/x
3. Step 3: Cross multiply
   1,445.09x = 1,994.24 × 855.50
4. Step 4: Simplify right side
   1,445.09x = 1,706,079.44
5. Step 5: Solve for x
   x = 1,706,079.44/1,445.09
6. Step 6: Final answer
   x = 1,180.61