Finding the Fourth Proportional to 2,631.74, 3,946.46 and 1,398.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,631.74 : 3,946.46 = 1,398.87 : x
2. Step 2: Convert to fraction form
   2,631.74/3,946.46 = 1,398.87/x
3. Step 3: Cross multiply
   2,631.74x = 3,946.46 × 1,398.87
4. Step 4: Simplify right side
   2,631.74x = 5,520,577.51
5. Step 5: Solve for x
   x = 5,520,577.51/2,631.74
6. Step 6: Final answer
   x = 2,097.70