Finding the Fourth Proportional to 105,705.02, 145,871.87 and 57,958.25

Step by Step Solution

1. Step 1: Write the proportion equation
   105,705.02 : 145,871.87 = 57,958.25 : x
2. Step 2: Convert to fraction form
   105,705.02/145,871.87 = 57,958.25/x
3. Step 3: Cross multiply
   105,705.02x = 145,871.87 × 57,958.25
4. Step 4: Simplify right side
   105,705.02x = 8,454,478,384.32
5. Step 5: Solve for x
   x = 8,454,478,384.32/105,705.02
6. Step 6: Final answer
   x = 79,981.81