Finding the Fourth Proportional to 105,105.60, 145,040.40 and 57,358.56

Step by Step Solution

1. Step 1: Write the proportion equation
   105,105.60 : 145,040.40 = 57,358.56 : x
2. Step 2: Convert to fraction form
   105,105.60/145,040.40 = 57,358.56/x
3. Step 3: Cross multiply
   105,105.60x = 145,040.40 × 57,358.56
4. Step 4: Simplify right side
   105,105.60x = 8,319,308,485.82
5. Step 5: Solve for x
   x = 8,319,308,485.82/105,105.60
6. Step 6: Final answer
   x = 79,151.91