Finding the Fourth Proportional to 1,478.29, 2,039.89 and 815.11

Step by Step Solution

1. Step 1: Write the proportion equation
   1,478.29 : 2,039.89 = 815.11 : x
2. Step 2: Convert to fraction form
   1,478.29/2,039.89 = 815.11/x
3. Step 3: Cross multiply
   1,478.29x = 2,039.89 × 815.11
4. Step 4: Simplify right side
   1,478.29x = 1,662,722.50
5. Step 5: Solve for x
   x = 1,662,722.50/1,478.29
6. Step 6: Final answer
   x = 1,124.76