Finding the Fourth Proportional to 1,445.17, 1,994.45 and 815.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,445.17 : 1,994.45 = 815.67 : x
2. Step 2: Convert to fraction form
   1,445.17/1,994.45 = 815.67/x
3. Step 3: Cross multiply
   1,445.17x = 1,994.45 × 815.67
4. Step 4: Simplify right side
   1,445.17x = 1,626,813.03
5. Step 5: Solve for x
   x = 1,626,813.03/1,445.17
6. Step 6: Final answer
   x = 1,125.69