Finding the Fourth Proportional to 57,039, 85,140.72 and 50,305.53

Step by Step Solution

1. Step 1: Write the proportion equation
   57,039 : 85,140.72 = 50,305.53 : x
2. Step 2: Convert to fraction form
   57,039/85,140.72 = 50,305.53/x
3. Step 3: Cross multiply
   57,039x = 85,140.72 × 50,305.53
4. Step 4: Simplify right side
   57,039x = 4,283,049,044.18
5. Step 5: Solve for x
   x = 4,283,049,044.18/57,039
6. Step 6: Final answer
   x = 75,089.83