Finding the Fourth Proportional to 105,411.33, 145,467.45 and 57,664.71

Step by Step Solution

1. Step 1: Write the proportion equation
   105,411.33 : 145,467.45 = 57,664.71 : x
2. Step 2: Convert to fraction form
   105,411.33/145,467.45 = 57,664.71/x
3. Step 3: Cross multiply
   105,411.33x = 145,467.45 × 57,664.71
4. Step 4: Simplify right side
   105,411.33x = 8,388,338,318.69
5. Step 5: Solve for x
   x = 8,388,338,318.69/105,411.33
6. Step 6: Final answer
   x = 79,577.20