Finding the Fourth Proportional to 105,005.28, 144,905.52 and 57,258.96

Step by Step Solution

1. Step 1: Write the proportion equation
   105,005.28 : 144,905.52 = 57,258.96 : x
2. Step 2: Convert to fraction form
   105,005.28/144,905.52 = 57,258.96/x
3. Step 3: Cross multiply
   105,005.28x = 144,905.52 × 57,258.96
4. Step 4: Simplify right side
   105,005.28x = 8,297,139,373.46
5. Step 5: Solve for x
   x = 8,297,139,373.46/105,005.28
6. Step 6: Final answer
   x = 79,016.40