Finding the Fourth Proportional to 1,408.27, 2,109.69 and 790.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,408.27 : 2,109.69 = 790.10 : x
2. Step 2: Convert to fraction form
   1,408.27/2,109.69 = 790.10/x
3. Step 3: Cross multiply
   1,408.27x = 2,109.69 × 790.10
4. Step 4: Simplify right side
   1,408.27x = 1,666,866.07
5. Step 5: Solve for x
   x = 1,666,866.07/1,408.27
6. Step 6: Final answer
   x = 1,183.63