Finding the Fourth Proportional to 105,103.62, 145,040.22 and 57,357

Step by Step Solution

1. Step 1: Write the proportion equation
   105,103.62 : 145,040.22 = 57,357 : x
2. Step 2: Convert to fraction form
   105,103.62/145,040.22 = 57,357/x
3. Step 3: Cross multiply
   105,103.62x = 145,040.22 × 57,357
4. Step 4: Simplify right side
   105,103.62x = 8,319,071,898.54
5. Step 5: Solve for x
   x = 8,319,071,898.54/105,103.62
6. Step 6: Final answer
   x = 79,151.15