Finding the Fourth Proportional to 30,120.96, 45,086.71 and 20,705.91

Step by Step Solution

1. Step 1: Write the proportion equation
   30,120.96 : 45,086.71 = 20,705.91 : x
2. Step 2: Convert to fraction form
   30,120.96/45,086.71 = 20,705.91/x
3. Step 3: Cross multiply
   30,120.96x = 45,086.71 × 20,705.91
4. Step 4: Simplify right side
   30,120.96x = 933,561,359.46
5. Step 5: Solve for x
   x = 933,561,359.46/30,120.96
6. Step 6: Final answer
   x = 30,993.75