Finding the Fourth Proportional to 1,478.15, 2,039.86 and 815.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,478.15 : 2,039.86 = 815.03 : x
2. Step 2: Convert to fraction form
   1,478.15/2,039.86 = 815.03/x
3. Step 3: Cross multiply
   1,478.15x = 2,039.86 × 815.03
4. Step 4: Simplify right side
   1,478.15x = 1,662,544.03
5. Step 5: Solve for x
   x = 1,662,544.03/1,478.15
6. Step 6: Final answer
   x = 1,124.74