Finding the Fourth Proportional to 2,439.91, 3,656.42 and 1,398.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,439.91 : 3,656.42 = 1,398.34 : x
2. Step 2: Convert to fraction form
   2,439.91/3,656.42 = 1,398.34/x
3. Step 3: Cross multiply
   2,439.91x = 3,656.42 × 1,398.34
4. Step 4: Simplify right side
   2,439.91x = 5,112,918.34
5. Step 5: Solve for x
   x = 5,112,918.34/2,439.91
6. Step 6: Final answer
   x = 2,095.54