Finding the Fourth Proportional to 105,561.32, 145,667.04 and 57,806.96

Step by Step Solution

1. Step 1: Write the proportion equation
   105,561.32 : 145,667.04 = 57,806.96 : x
2. Step 2: Convert to fraction form
   105,561.32/145,667.04 = 57,806.96/x
3. Step 3: Cross multiply
   105,561.32x = 145,667.04 × 57,806.96
4. Step 4: Simplify right side
   105,561.32x = 8,420,568,754.60
5. Step 5: Solve for x
   x = 8,420,568,754.60/105,561.32
6. Step 6: Final answer
   x = 79,769.45