Finding the Fourth Proportional to 3,978.76, 5,966.42 and 1,637.14

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.76 : 5,966.42 = 1,637.14 : x
2. Step 2: Convert to fraction form
   3,978.76/5,966.42 = 1,637.14/x
3. Step 3: Cross multiply
   3,978.76x = 5,966.42 × 1,637.14
4. Step 4: Simplify right side
   3,978.76x = 9,767,864.84
5. Step 5: Solve for x
   x = 9,767,864.84/3,978.76
6. Step 6: Final answer
   x = 2,455.00