Finding the Fourth Proportional to 1,478.89, 2,040.86 and 815.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,478.89 : 2,040.86 = 815.75 : x
2. Step 2: Convert to fraction form
   1,478.89/2,040.86 = 815.75/x
3. Step 3: Cross multiply
   1,478.89x = 2,040.86 × 815.75
4. Step 4: Simplify right side
   1,478.89x = 1,664,834.10
5. Step 5: Solve for x
   x = 1,664,834.10/1,478.89
6. Step 6: Final answer
   x = 1,125.73