Finding the Fourth Proportional to 30,558.72, 45,779.52 and 20,680.96

Step by Step Solution

1. Step 1: Write the proportion equation
   30,558.72 : 45,779.52 = 20,680.96 : x
2. Step 2: Convert to fraction form
   30,558.72/45,779.52 = 20,680.96/x
3. Step 3: Cross multiply
   30,558.72x = 45,779.52 × 20,680.96
4. Step 4: Simplify right side
   30,558.72x = 946,764,421.94
5. Step 5: Solve for x
   x = 946,764,421.94/30,558.72
6. Step 6: Final answer
   x = 30,981.81