Finding the Fourth Proportional to 105,648.96, 145,796.72 and 57,901.28

Step by Step Solution

1. Step 1: Write the proportion equation
   105,648.96 : 145,796.72 = 57,901.28 : x
2. Step 2: Convert to fraction form
   105,648.96/145,796.72 = 57,901.28/x
3. Step 3: Cross multiply
   105,648.96x = 145,796.72 × 57,901.28
4. Step 4: Simplify right side
   105,648.96x = 8,441,816,707.80
5. Step 5: Solve for x
   x = 8,441,816,707.80/105,648.96
6. Step 6: Final answer
   x = 79,904.40