Finding the Fourth Proportional to 57,072.50, 78,758.53 and 31,578.20

Step by Step Solution

1. Step 1: Write the proportion equation
   57,072.50 : 78,758.53 = 31,578.20 : x
2. Step 2: Convert to fraction form
   57,072.50/78,758.53 = 31,578.20/x
3. Step 3: Cross multiply
   57,072.50x = 78,758.53 × 31,578.20
4. Step 4: Simplify right side
   57,072.50x = 2,487,052,139.31
5. Step 5: Solve for x
   x = 2,487,052,139.31/57,072.50
6. Step 6: Final answer
   x = 43,577.07