Finding the Fourth Proportional to 12,570.72, 17,350.02 and 8,321.87

Step by Step Solution

1. Step 1: Write the proportion equation
   12,570.72 : 17,350.02 = 8,321.87 : x
2. Step 2: Convert to fraction form
   12,570.72/17,350.02 = 8,321.87/x
3. Step 3: Cross multiply
   12,570.72x = 17,350.02 × 8,321.87
4. Step 4: Simplify right side
   12,570.72x = 144,384,524.19
5. Step 5: Solve for x
   x = 144,384,524.19/12,570.72
6. Step 6: Final answer
   x = 11,485.78