Finding the Fourth Proportional to 20,271.60, 30,410.76 and 7,120.56

Step by Step Solution

1. Step 1: Write the proportion equation
   20,271.60 : 30,410.76 = 7,120.56 : x
2. Step 2: Convert to fraction form
   20,271.60/30,410.76 = 7,120.56/x
3. Step 3: Cross multiply
   20,271.60x = 30,410.76 × 7,120.56
4. Step 4: Simplify right side
   20,271.60x = 216,541,641.23
5. Step 5: Solve for x
   x = 216,541,641.23/20,271.60
6. Step 6: Final answer
   x = 10,682.02