Finding the Fourth Proportional to 20,969.16, 31,452.72 and 7,820.50

Step by Step Solution

1. Step 1: Write the proportion equation
   20,969.16 : 31,452.72 = 7,820.50 : x
2. Step 2: Convert to fraction form
   20,969.16/31,452.72 = 7,820.50/x
3. Step 3: Cross multiply
   20,969.16x = 31,452.72 × 7,820.50
4. Step 4: Simplify right side
   20,969.16x = 245,975,996.76
5. Step 5: Solve for x
   x = 245,975,996.76/20,969.16
6. Step 6: Final answer
   x = 11,730.37