Finding the Fourth Proportional to 1,379.55, 1,903.74 and 790.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.55 : 1,903.74 = 790.08 : x
2. Step 2: Convert to fraction form
   1,379.55/1,903.74 = 790.08/x
3. Step 3: Cross multiply
   1,379.55x = 1,903.74 × 790.08
4. Step 4: Simplify right side
   1,379.55x = 1,504,106.90
5. Step 5: Solve for x
   x = 1,504,106.90/1,379.55
6. Step 6: Final answer
   x = 1,090.29