Finding the Fourth Proportional to 1,404.57, 1,938.16 and 815.00

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.57 : 1,938.16 = 815.00 : x
2. Step 2: Convert to fraction form
   1,404.57/1,938.16 = 815.00/x
3. Step 3: Cross multiply
   1,404.57x = 1,938.16 × 815.00
4. Step 4: Simplify right side
   1,404.57x = 1,579,591.73
5. Step 5: Solve for x
   x = 1,579,591.73/1,404.57
6. Step 6: Final answer
   x = 1,124.61