Finding the Fourth Proportional to 105,415.57, 145,474.63 and 57,667.89

Step by Step Solution

1. Step 1: Write the proportion equation
   105,415.57 : 145,474.63 = 57,667.89 : x
2. Step 2: Convert to fraction form
   105,415.57/145,474.63 = 57,667.89/x
3. Step 3: Cross multiply
   105,415.57x = 145,474.63 × 57,667.89
4. Step 4: Simplify right side
   105,415.57x = 8,389,214,960.63
5. Step 5: Solve for x
   x = 8,389,214,960.63/105,415.57
6. Step 6: Final answer
   x = 79,582.31