Finding the Fourth Proportional to 105,650.40, 145,796.88 and 57,906.72

Step by Step Solution

1. Step 1: Write the proportion equation
   105,650.40 : 145,796.88 = 57,906.72 : x
2. Step 2: Convert to fraction form
   105,650.40/145,796.88 = 57,906.72/x
3. Step 3: Cross multiply
   105,650.40x = 145,796.88 × 57,906.72
4. Step 4: Simplify right side
   105,650.40x = 8,442,619,107.03
5. Step 5: Solve for x
   x = 8,442,619,107.03/105,650.40
6. Step 6: Final answer
   x = 79,910.91