Finding the Fourth Proportional to 20,705.41, 31,057.83 and 5,123.05

Step by Step Solution

1. Step 1: Write the proportion equation
   20,705.41 : 31,057.83 = 5,123.05 : x
2. Step 2: Convert to fraction form
   20,705.41/31,057.83 = 5,123.05/x
3. Step 3: Cross multiply
   20,705.41x = 31,057.83 × 5,123.05
4. Step 4: Simplify right side
   20,705.41x = 159,110,815.98
5. Step 5: Solve for x
   x = 159,110,815.98/20,705.41
6. Step 6: Final answer
   x = 7,684.50