Finding the Fourth Proportional to 1,978.37, 2,725.39 and 1,663.64

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.37 : 2,725.39 = 1,663.64 : x
2. Step 2: Convert to fraction form
   1,978.37/2,725.39 = 1,663.64/x
3. Step 3: Cross multiply
   1,978.37x = 2,725.39 × 1,663.64
4. Step 4: Simplify right side
   1,978.37x = 4,534,066.49
5. Step 5: Solve for x
   x = 4,534,066.49/1,978.37
6. Step 6: Final answer
   x = 2,291.82