Finding the Fourth Proportional to 20,145.60, 30,215.61 and 5,355.72

Step by Step Solution

1. Step 1: Write the proportion equation
   20,145.60 : 30,215.61 = 5,355.72 : x
2. Step 2: Convert to fraction form
   20,145.60/30,215.61 = 5,355.72/x
3. Step 3: Cross multiply
   20,145.60x = 30,215.61 × 5,355.72
4. Step 4: Simplify right side
   20,145.60x = 161,826,320.01
5. Step 5: Solve for x
   x = 161,826,320.01/20,145.60
6. Step 6: Final answer
   x = 8,032.84