Finding the Fourth Proportional to 12,945.52, 17,870.70 and 8,469.46

Step by Step Solution

1. Step 1: Write the proportion equation
   12,945.52 : 17,870.70 = 8,469.46 : x
2. Step 2: Convert to fraction form
   12,945.52/17,870.70 = 8,469.46/x
3. Step 3: Cross multiply
   12,945.52x = 17,870.70 × 8,469.46
4. Step 4: Simplify right side
   12,945.52x = 151,355,178.82
5. Step 5: Solve for x
   x = 151,355,178.82/12,945.52
6. Step 6: Final answer
   x = 11,691.70