Finding the Fourth Proportional to 1,390.29, 1,918.82 and 792.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,390.29 : 1,918.82 = 792.78 : x
2. Step 2: Convert to fraction form
   1,390.29/1,918.82 = 792.78/x
3. Step 3: Cross multiply
   1,390.29x = 1,918.82 × 792.78
4. Step 4: Simplify right side
   1,390.29x = 1,521,207.40
5. Step 5: Solve for x
   x = 1,521,207.40/1,390.29
6. Step 6: Final answer
   x = 1,094.17