Finding the Fourth Proportional to 105,506.56, 145,601.61 and 57,759.76

Step by Step Solution

1. Step 1: Write the proportion equation
   105,506.56 : 145,601.61 = 57,759.76 : x
2. Step 2: Convert to fraction form
   105,506.56/145,601.61 = 57,759.76/x
3. Step 3: Cross multiply
   105,506.56x = 145,601.61 × 57,759.76
4. Step 4: Simplify right side
   105,506.56x = 8,409,914,049.21
5. Step 5: Solve for x
   x = 8,409,914,049.21/105,506.56
6. Step 6: Final answer
   x = 79,709.87