Finding the Fourth Proportional to 105,725, 145,887.09 and 57,965.78

Step by Step Solution

1. Step 1: Write the proportion equation
   105,725 : 145,887.09 = 57,965.78 : x
2. Step 2: Convert to fraction form
   105,725/145,887.09 = 57,965.78/x
3. Step 3: Cross multiply
   105,725x = 145,887.09 × 57,965.78
4. Step 4: Simplify right side
   105,725x = 8,456,458,963.78
5. Step 5: Solve for x
   x = 8,456,458,963.78/105,725
6. Step 6: Final answer
   x = 79,985.42