Finding the Fourth Proportional to 1,379.54, 1,904.04 and 790.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.54 : 1,904.04 = 790.47 : x
2. Step 2: Convert to fraction form
   1,379.54/1,904.04 = 790.47/x
3. Step 3: Cross multiply
   1,379.54x = 1,904.04 × 790.47
4. Step 4: Simplify right side
   1,379.54x = 1,505,086.50
5. Step 5: Solve for x
   x = 1,505,086.50/1,379.54
6. Step 6: Final answer
   x = 1,091.00