Finding the Fourth Proportional to 105,517.34, 145,608.18 and 57,761.46

Step by Step Solution

1. Step 1: Write the proportion equation
   105,517.34 : 145,608.18 = 57,761.46 : x
2. Step 2: Convert to fraction form
   105,517.34/145,608.18 = 57,761.46/x
3. Step 3: Cross multiply
   105,517.34x = 145,608.18 × 57,761.46
4. Step 4: Simplify right side
   105,517.34x = 8,410,541,064.74
5. Step 5: Solve for x
   x = 8,410,541,064.74/105,517.34
6. Step 6: Final answer
   x = 79,707.67