Finding the Fourth Proportional to 1,445.51, 1,994.56 and 815.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,445.51 : 1,994.56 = 815.96 : x
2. Step 2: Convert to fraction form
   1,445.51/1,994.56 = 815.96/x
3. Step 3: Cross multiply
   1,445.51x = 1,994.56 × 815.96
4. Step 4: Simplify right side
   1,445.51x = 1,627,484.12
5. Step 5: Solve for x
   x = 1,627,484.12/1,445.51
6. Step 6: Final answer
   x = 1,125.89