Finding the Fourth Proportional to 1,978.57, 2,728.62 and 1,698.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.57 : 2,728.62 = 1,698.72 : x
2. Step 2: Convert to fraction form
   1,978.57/2,728.62 = 1,698.72/x
3. Step 3: Cross multiply
   1,978.57x = 2,728.62 × 1,698.72
4. Step 4: Simplify right side
   1,978.57x = 4,635,160.92
5. Step 5: Solve for x
   x = 4,635,160.92/1,978.57
6. Step 6: Final answer
   x = 2,342.68