Finding the Fourth Proportional to 1,445.30, 1,994.52 and 815.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,445.30 : 1,994.52 = 815.86 : x
2. Step 2: Convert to fraction form
   1,445.30/1,994.52 = 815.86/x
3. Step 3: Cross multiply
   1,445.30x = 1,994.52 × 815.86
4. Step 4: Simplify right side
   1,445.30x = 1,627,241.89
5. Step 5: Solve for x
   x = 1,627,241.89/1,445.30
6. Step 6: Final answer
   x = 1,125.88