Finding the Fourth Proportional to 2,630.84, 3,945 and 1,398.83

Step by Step Solution

1. Step 1: Write the proportion equation
   2,630.84 : 3,945 = 1,398.83 : x
2. Step 2: Convert to fraction form
   2,630.84/3,945 = 1,398.83/x
3. Step 3: Cross multiply
   2,630.84x = 3,945 × 1,398.83
4. Step 4: Simplify right side
   2,630.84x = 5,518,384.35
5. Step 5: Solve for x
   x = 5,518,384.35/2,630.84
6. Step 6: Final answer
   x = 2,097.58