Finding the Fourth Proportional to 1,404.74, 1,938.50 and 815.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.74 : 1,938.50 = 815.28 : x
2. Step 2: Convert to fraction form
   1,404.74/1,938.50 = 815.28/x
3. Step 3: Cross multiply
   1,404.74x = 1,938.50 × 815.28
4. Step 4: Simplify right side
   1,404.74x = 1,580,420.28
5. Step 5: Solve for x
   x = 1,580,420.28/1,404.74
6. Step 6: Final answer
   x = 1,125.06