Finding the Fourth Proportional to 1,445.17, 1,994.46 and 855.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,445.17 : 1,994.46 = 855.61 : x
2. Step 2: Convert to fraction form
   1,445.17/1,994.46 = 855.61/x
3. Step 3: Cross multiply
   1,445.17x = 1,994.46 × 855.61
4. Step 4: Simplify right side
   1,445.17x = 1,706,479.92
5. Step 5: Solve for x
   x = 1,706,479.92/1,445.17
6. Step 6: Final answer
   x = 1,180.82