Finding the Fourth Proportional to 3,978.68, 5,966.49 and 1,757.40

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.68 : 5,966.49 = 1,757.40 : x
2. Step 2: Convert to fraction form
   3,978.68/5,966.49 = 1,757.40/x
3. Step 3: Cross multiply
   3,978.68x = 5,966.49 × 1,757.40
4. Step 4: Simplify right side
   3,978.68x = 10,485,478.91
5. Step 5: Solve for x
   x = 10,485,478.91/3,978.68
6. Step 6: Final answer
   x = 2,635.42