Finding the Fourth Proportional to 8,974.20, 12,378.88 and 5,786.31

Step by Step Solution

1. Step 1: Write the proportion equation
   8,974.20 : 12,378.88 = 5,786.31 : x
2. Step 2: Convert to fraction form
   8,974.20/12,378.88 = 5,786.31/x
3. Step 3: Cross multiply
   8,974.20x = 12,378.88 × 5,786.31
4. Step 4: Simplify right side
   8,974.20x = 71,628,051.60
5. Step 5: Solve for x
   x = 71,628,051.60/8,974.20
6. Step 6: Final answer
   x = 7,981.55