Finding the Fourth Proportional to 1,390.19, 1,918.63 and 792.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,390.19 : 1,918.63 = 792.89 : x
2. Step 2: Convert to fraction form
   1,390.19/1,918.63 = 792.89/x
3. Step 3: Cross multiply
   1,390.19x = 1,918.63 × 792.89
4. Step 4: Simplify right side
   1,390.19x = 1,521,268.33
5. Step 5: Solve for x
   x = 1,521,268.33/1,390.19
6. Step 6: Final answer
   x = 1,094.29