Finding the Fourth Proportional to 1,445.13, 1,994.24 and 815.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,445.13 : 1,994.24 = 815.72 : x
2. Step 2: Convert to fraction form
   1,445.13/1,994.24 = 815.72/x
3. Step 3: Cross multiply
   1,445.13x = 1,994.24 × 815.72
4. Step 4: Simplify right side
   1,445.13x = 1,626,727.40
5. Step 5: Solve for x
   x = 1,626,727.40/1,445.13
6. Step 6: Final answer
   x = 1,125.66