Finding the Fourth Proportional to 1,379.85, 1,903.75 and 790.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.85 : 1,903.75 = 790.27 : x
2. Step 2: Convert to fraction form
   1,379.85/1,903.75 = 790.27/x
3. Step 3: Cross multiply
   1,379.85x = 1,903.75 × 790.27
4. Step 4: Simplify right side
   1,379.85x = 1,504,476.51
5. Step 5: Solve for x
   x = 1,504,476.51/1,379.85
6. Step 6: Final answer
   x = 1,090.32