Finding the Fourth Proportional to 20,474.16, 30,704.71 and 7,991.15

Step by Step Solution

1. Step 1: Write the proportion equation
   20,474.16 : 30,704.71 = 7,991.15 : x
2. Step 2: Convert to fraction form
   20,474.16/30,704.71 = 7,991.15/x
3. Step 3: Cross multiply
   20,474.16x = 30,704.71 × 7,991.15
4. Step 4: Simplify right side
   20,474.16x = 245,365,943.32
5. Step 5: Solve for x
   x = 245,365,943.32/20,474.16
6. Step 6: Final answer
   x = 11,984.18