Finding the Fourth Proportional to 5,777.56, 7,968.72 and 3,985.60

Step by Step Solution

1. Step 1: Write the proportion equation
   5,777.56 : 7,968.72 = 3,985.60 : x
2. Step 2: Convert to fraction form
   5,777.56/7,968.72 = 3,985.60/x
3. Step 3: Cross multiply
   5,777.56x = 7,968.72 × 3,985.60
4. Step 4: Simplify right side
   5,777.56x = 31,760,130.43
5. Step 5: Solve for x
   x = 31,760,130.43/5,777.56
6. Step 6: Final answer
   x = 5,497.15