Finding the Fourth Proportional to 5,287.49, 7,957.79 and 3,978.04

Step by Step Solution

1. Step 1: Write the proportion equation
   5,287.49 : 7,957.79 = 3,978.04 : x
2. Step 2: Convert to fraction form
   5,287.49/7,957.79 = 3,978.04/x
3. Step 3: Cross multiply
   5,287.49x = 7,957.79 × 3,978.04
4. Step 4: Simplify right side
   5,287.49x = 31,656,406.93
5. Step 5: Solve for x
   x = 31,656,406.93/5,287.49
6. Step 6: Final answer
   x = 5,987.04