Finding the Fourth Proportional to 1,978.17, 2,728.06 and 1,698.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.17 : 2,728.06 = 1,698.31 : x
2. Step 2: Convert to fraction form
   1,978.17/2,728.06 = 1,698.31/x
3. Step 3: Cross multiply
   1,978.17x = 2,728.06 × 1,698.31
4. Step 4: Simplify right side
   1,978.17x = 4,633,100.30
5. Step 5: Solve for x
   x = 4,633,100.30/1,978.17
6. Step 6: Final answer
   x = 2,342.12