Finding the Fourth Proportional to 2,603.40, 3,905.46 and 847.83

Step by Step Solution

1. Step 1: Write the proportion equation
   2,603.40 : 3,905.46 = 847.83 : x
2. Step 2: Convert to fraction form
   2,603.40/3,905.46 = 847.83/x
3. Step 3: Cross multiply
   2,603.40x = 3,905.46 × 847.83
4. Step 4: Simplify right side
   2,603.40x = 3,311,166.15
5. Step 5: Solve for x
   x = 3,311,166.15/2,603.40
6. Step 6: Final answer
   x = 1,271.86