Finding the Fourth Proportional to 1,408.30, 1,943.46 and 778.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,408.30 : 1,943.46 = 778.79 : x
2. Step 2: Convert to fraction form
   1,408.30/1,943.46 = 778.79/x
3. Step 3: Cross multiply
   1,408.30x = 1,943.46 × 778.79
4. Step 4: Simplify right side
   1,408.30x = 1,513,547.21
5. Step 5: Solve for x
   x = 1,513,547.21/1,408.30
6. Step 6: Final answer
   x = 1,074.74