Finding the Fourth Proportional to 105,726.69, 145,903.02 and 57,980.37

Step by Step Solution

1. Step 1: Write the proportion equation
   105,726.69 : 145,903.02 = 57,980.37 : x
2. Step 2: Convert to fraction form
   105,726.69/145,903.02 = 57,980.37/x
3. Step 3: Cross multiply
   105,726.69x = 145,903.02 × 57,980.37
4. Step 4: Simplify right side
   105,726.69x = 8,459,511,083.72
5. Step 5: Solve for x
   x = 8,459,511,083.72/105,726.69
6. Step 6: Final answer
   x = 80,013.01