Finding the Fourth Proportional to 105,488.55, 145,568.57 and 57,732.66

Step by Step Solution

1. Step 1: Write the proportion equation
   105,488.55 : 145,568.57 = 57,732.66 : x
2. Step 2: Convert to fraction form
   105,488.55/145,568.57 = 57,732.66/x
3. Step 3: Cross multiply
   105,488.55x = 145,568.57 × 57,732.66
4. Step 4: Simplify right side
   105,488.55x = 8,404,060,469.83
5. Step 5: Solve for x
   x = 8,404,060,469.83/105,488.55
6. Step 6: Final answer
   x = 79,667.99