Finding the Fourth Proportional to 105,507.03, 145,599.71 and 57,760.38

Step by Step Solution

1. Step 1: Write the proportion equation
   105,507.03 : 145,599.71 = 57,760.38 : x
2. Step 2: Convert to fraction form
   105,507.03/145,599.71 = 57,760.38/x
3. Step 3: Cross multiply
   105,507.03x = 145,599.71 × 57,760.38
4. Step 4: Simplify right side
   105,507.03x = 8,409,894,288.69
5. Step 5: Solve for x
   x = 8,409,894,288.69/105,507.03
6. Step 6: Final answer
   x = 79,709.33