Finding the Fourth Proportional to 2,342.61, 3,228.35 and 1,678.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,342.61 : 3,228.35 = 1,678.31 : x
2. Step 2: Convert to fraction form
   2,342.61/3,228.35 = 1,678.31/x
3. Step 3: Cross multiply
   2,342.61x = 3,228.35 × 1,678.31
4. Step 4: Simplify right side
   2,342.61x = 5,418,172.09
5. Step 5: Solve for x
   x = 5,418,172.09/2,342.61
6. Step 6: Final answer
   x = 2,312.88