Finding the Fourth Proportional to 1,445.27, 1,994.42 and 815.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,445.27 : 1,994.42 = 815.79 : x
2. Step 2: Convert to fraction form
   1,445.27/1,994.42 = 815.79/x
3. Step 3: Cross multiply
   1,445.27x = 1,994.42 × 815.79
4. Step 4: Simplify right side
   1,445.27x = 1,627,023.81
5. Step 5: Solve for x
   x = 1,627,023.81/1,445.27
6. Step 6: Final answer
   x = 1,125.76