Finding the Fourth Proportional to 105,411.11, 145,467.77 and 57,665.25

Step by Step Solution

1. Step 1: Write the proportion equation
   105,411.11 : 145,467.77 = 57,665.25 : x
2. Step 2: Convert to fraction form
   105,411.11/145,467.77 = 57,665.25/x
3. Step 3: Cross multiply
   105,411.11x = 145,467.77 × 57,665.25
4. Step 4: Simplify right side
   105,411.11x = 8,388,435,035.67
5. Step 5: Solve for x
   x = 8,388,435,035.67/105,411.11
6. Step 6: Final answer
   x = 79,578.29