Finding the Fourth Proportional to 3,971.95, 5,953.61 and 2,991.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,971.95 : 5,953.61 = 2,991.31 : x
2. Step 2: Convert to fraction form
   3,971.95/5,953.61 = 2,991.31/x
3. Step 3: Cross multiply
   3,971.95x = 5,953.61 × 2,991.31
4. Step 4: Simplify right side
   3,971.95x = 17,809,104.27
5. Step 5: Solve for x
   x = 17,809,104.27/3,971.95
6. Step 6: Final answer
   x = 4,483.72