Finding the Fourth Proportional to 1,404.58, 1,938.30 and 815.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.58 : 1,938.30 = 815.45 : x
2. Step 2: Convert to fraction form
   1,404.58/1,938.30 = 815.45/x
3. Step 3: Cross multiply
   1,404.58x = 1,938.30 × 815.45
4. Step 4: Simplify right side
   1,404.58x = 1,580,586.74
5. Step 5: Solve for x
   x = 1,580,586.74/1,404.58
6. Step 6: Final answer
   x = 1,125.31