Finding the Fourth Proportional to 105,705.77, 145,872.90 and 57,959.01

Step by Step Solution

1. Step 1: Write the proportion equation
   105,705.77 : 145,872.90 = 57,959.01 : x
2. Step 2: Convert to fraction form
   105,705.77/145,872.90 = 57,959.01/x
3. Step 3: Cross multiply
   105,705.77x = 145,872.90 × 57,959.01
4. Step 4: Simplify right side
   105,705.77x = 8,454,648,869.83
5. Step 5: Solve for x
   x = 8,454,648,869.83/105,705.77
6. Step 6: Final answer
   x = 79,982.85