Finding the Fourth Proportional to 57,185.89, 78,919.68 and 31,691.72

Step by Step Solution

1. Step 1: Write the proportion equation
   57,185.89 : 78,919.68 = 31,691.72 : x
2. Step 2: Convert to fraction form
   57,185.89/78,919.68 = 31,691.72/x
3. Step 3: Cross multiply
   57,185.89x = 78,919.68 × 31,691.72
4. Step 4: Simplify right side
   57,185.89x = 2,501,100,401.05
5. Step 5: Solve for x
   x = 2,501,100,401.05/57,185.89
6. Step 6: Final answer
   x = 43,736.32