Finding the Fourth Proportional to 11,945.27, 17,920.17 and 5,705.78

Step by Step Solution

1. Step 1: Write the proportion equation
   11,945.27 : 17,920.17 = 5,705.78 : x
2. Step 2: Convert to fraction form
   11,945.27/17,920.17 = 5,705.78/x
3. Step 3: Cross multiply
   11,945.27x = 17,920.17 × 5,705.78
4. Step 4: Simplify right side
   11,945.27x = 102,248,457.98
5. Step 5: Solve for x
   x = 102,248,457.98/11,945.27
6. Step 6: Final answer
   x = 8,559.74