Finding the Fourth Proportional to 1,390.34, 1,918.56 and 792.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,390.34 : 1,918.56 = 792.75 : x
2. Step 2: Convert to fraction form
   1,390.34/1,918.56 = 792.75/x
3. Step 3: Cross multiply
   1,390.34x = 1,918.56 × 792.75
4. Step 4: Simplify right side
   1,390.34x = 1,520,938.44
5. Step 5: Solve for x
   x = 1,520,938.44/1,390.34
6. Step 6: Final answer
   x = 1,093.94