Finding the Fourth Proportional to 8,945.79, 13,401.77 and 8,570.43

Step by Step Solution

1. Step 1: Write the proportion equation
   8,945.79 : 13,401.77 = 8,570.43 : x
2. Step 2: Convert to fraction form
   8,945.79/13,401.77 = 8,570.43/x
3. Step 3: Cross multiply
   8,945.79x = 13,401.77 × 8,570.43
4. Step 4: Simplify right side
   8,945.79x = 114,858,888.81
5. Step 5: Solve for x
   x = 114,858,888.81/8,945.79
6. Step 6: Final answer
   x = 12,839.43