Finding the Fourth Proportional to 57,919.50, 79,928.91 and 31,423.50

Step by Step Solution

1. Step 1: Write the proportion equation
   57,919.50 : 79,928.91 = 31,423.50 : x
2. Step 2: Convert to fraction form
   57,919.50/79,928.91 = 31,423.50/x
3. Step 3: Cross multiply
   57,919.50x = 79,928.91 × 31,423.50
4. Step 4: Simplify right side
   57,919.50x = 2,511,646,103.39
5. Step 5: Solve for x
   x = 2,511,646,103.39/57,919.50
6. Step 6: Final answer
   x = 43,364.43