Finding the Fourth Proportional to 105,580.40, 145,581.37 and 67,288.73

Step by Step Solution

1. Step 1: Write the proportion equation
   105,580.40 : 145,581.37 = 67,288.73 : x
2. Step 2: Convert to fraction form
   105,580.40/145,581.37 = 67,288.73/x
3. Step 3: Cross multiply
   105,580.40x = 145,581.37 × 67,288.73
4. Step 4: Simplify right side
   105,580.40x = 9,795,984,602.83
5. Step 5: Solve for x
   x = 9,795,984,602.83/105,580.40
6. Step 6: Final answer
   x = 92,782.23