Finding the Fourth Proportional to 2,305.15, 3,455.83 and 917.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,305.15 : 3,455.83 = 917.89 : x
2. Step 2: Convert to fraction form
   2,305.15/3,455.83 = 917.89/x
3. Step 3: Cross multiply
   2,305.15x = 3,455.83 × 917.89
4. Step 4: Simplify right side
   2,305.15x = 3,172,071.80
5. Step 5: Solve for x
   x = 3,172,071.80/2,305.15
6. Step 6: Final answer
   x = 1,376.08