Finding the Fourth Proportional to 1,404.68, 1,938.60 and 815.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.68 : 1,938.60 = 815.54 : x
2. Step 2: Convert to fraction form
   1,404.68/1,938.60 = 815.54/x
3. Step 3: Cross multiply
   1,404.68x = 1,938.60 × 815.54
4. Step 4: Simplify right side
   1,404.68x = 1,580,996.15
5. Step 5: Solve for x
   x = 1,580,996.15/1,404.68
6. Step 6: Final answer
   x = 1,125.52