Finding the Fourth Proportional to 1,404.63, 1,937.97 and 815.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.63 : 1,937.97 = 815.15 : x
2. Step 2: Convert to fraction form
   1,404.63/1,937.97 = 815.15/x
3. Step 3: Cross multiply
   1,404.63x = 1,937.97 × 815.15
4. Step 4: Simplify right side
   1,404.63x = 1,579,736.25
5. Step 5: Solve for x
   x = 1,579,736.25/1,404.63
6. Step 6: Final answer
   x = 1,124.66