Finding the Fourth Proportional to 105,621.11, 145,760.52 and 57,877.49

Step by Step Solution

1. Step 1: Write the proportion equation
   105,621.11 : 145,760.52 = 57,877.49 : x
2. Step 2: Convert to fraction form
   105,621.11/145,760.52 = 57,877.49/x
3. Step 3: Cross multiply
   105,621.11x = 145,760.52 × 57,877.49
4. Step 4: Simplify right side
   105,621.11x = 8,436,253,038.69
5. Step 5: Solve for x
   x = 8,436,253,038.69/105,621.11
6. Step 6: Final answer
   x = 79,872.79