Finding the Fourth Proportional to 1,978.08, 2,728.43 and 1,557.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.08 : 2,728.43 = 1,557.73 : x
2. Step 2: Convert to fraction form
   1,978.08/2,728.43 = 1,557.73/x
3. Step 3: Cross multiply
   1,978.08x = 2,728.43 × 1,557.73
4. Step 4: Simplify right side
   1,978.08x = 4,250,149.48
5. Step 5: Solve for x
   x = 4,250,149.48/1,978.08
6. Step 6: Final answer
   x = 2,148.63