Finding the Fourth Proportional to 105,569.16, 145,679.22 and 57,813

Step by Step Solution

1. Step 1: Write the proportion equation
   105,569.16 : 145,679.22 = 57,813 : x
2. Step 2: Convert to fraction form
   105,569.16/145,679.22 = 57,813/x
3. Step 3: Cross multiply
   105,569.16x = 145,679.22 × 57,813
4. Step 4: Simplify right side
   105,569.16x = 8,422,152,745.86
5. Step 5: Solve for x
   x = 8,422,152,745.86/105,569.16
6. Step 6: Final answer
   x = 79,778.53