Finding the Fourth Proportional to 5,783.55, 7,977.18 and 3,991.71

Step by Step Solution

1. Step 1: Write the proportion equation
   5,783.55 : 7,977.18 = 3,991.71 : x
2. Step 2: Convert to fraction form
   5,783.55/7,977.18 = 3,991.71/x
3. Step 3: Cross multiply
   5,783.55x = 7,977.18 × 3,991.71
4. Step 4: Simplify right side
   5,783.55x = 31,842,589.18
5. Step 5: Solve for x
   x = 31,842,589.18/5,783.55
6. Step 6: Final answer
   x = 5,505.72