Finding the Fourth Proportional to 105,365.33, 145,404.15 and 57,618.71

Step by Step Solution

1. Step 1: Write the proportion equation
   105,365.33 : 145,404.15 = 57,618.71 : x
2. Step 2: Convert to fraction form
   105,365.33/145,404.15 = 57,618.71/x
3. Step 3: Cross multiply
   105,365.33x = 145,404.15 × 57,618.71
4. Step 4: Simplify right side
   105,365.33x = 8,377,999,551.65
5. Step 5: Solve for x
   x = 8,377,999,551.65/105,365.33
6. Step 6: Final answer
   x = 79,513.82