Finding the Fourth Proportional to 1,390.69, 1,918.95 and 793.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,390.69 : 1,918.95 = 793.09 : x
2. Step 2: Convert to fraction form
   1,390.69/1,918.95 = 793.09/x
3. Step 3: Cross multiply
   1,390.69x = 1,918.95 × 793.09
4. Step 4: Simplify right side
   1,390.69x = 1,521,892.03
5. Step 5: Solve for x
   x = 1,521,892.03/1,390.69
6. Step 6: Final answer
   x = 1,094.34