Finding the Fourth Proportional to 1,445.15, 1,994.41 and 815.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,445.15 : 1,994.41 = 815.73 : x
2. Step 2: Convert to fraction form
   1,445.15/1,994.41 = 815.73/x
3. Step 3: Cross multiply
   1,445.15x = 1,994.41 × 815.73
4. Step 4: Simplify right side
   1,445.15x = 1,626,911.80
5. Step 5: Solve for x
   x = 1,626,911.80/1,445.15
6. Step 6: Final answer
   x = 1,125.77