Finding the Fourth Proportional to 1,445.38, 1,994.50 and 855.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,445.38 : 1,994.50 = 855.80 : x
2. Step 2: Convert to fraction form
   1,445.38/1,994.50 = 855.80/x
3. Step 3: Cross multiply
   1,445.38x = 1,994.50 × 855.80
4. Step 4: Simplify right side
   1,445.38x = 1,706,893.10
5. Step 5: Solve for x
   x = 1,706,893.10/1,445.38
6. Step 6: Final answer
   x = 1,180.93