Finding the Fourth Proportional to 105,238, 145,238.43 and 57,498.54

Step by Step Solution

1. Step 1: Write the proportion equation
   105,238 : 145,238.43 = 57,498.54 : x
2. Step 2: Convert to fraction form
   105,238/145,238.43 = 57,498.54/x
3. Step 3: Cross multiply
   105,238x = 145,238.43 × 57,498.54
4. Step 4: Simplify right side
   105,238x = 8,350,997,676.89
5. Step 5: Solve for x
   x = 8,350,997,676.89/105,238
6. Step 6: Final answer
   x = 79,353.44