Finding the Fourth Proportional to 105,506.88, 145,599.60 and 57,760.56

Step by Step Solution

1. Step 1: Write the proportion equation
   105,506.88 : 145,599.60 = 57,760.56 : x
2. Step 2: Convert to fraction form
   105,506.88/145,599.60 = 57,760.56/x
3. Step 3: Cross multiply
   105,506.88x = 145,599.60 × 57,760.56
4. Step 4: Simplify right side
   105,506.88x = 8,409,914,431.78
5. Step 5: Solve for x
   x = 8,409,914,431.78/105,506.88
6. Step 6: Final answer
   x = 79,709.63