Finding the Fourth Proportional to 12,474.72, 17,215.90 and 7,170.36

Step by Step Solution

1. Step 1: Write the proportion equation
   12,474.72 : 17,215.90 = 7,170.36 : x
2. Step 2: Convert to fraction form
   12,474.72/17,215.90 = 7,170.36/x
3. Step 3: Cross multiply
   12,474.72x = 17,215.90 × 7,170.36
4. Step 4: Simplify right side
   12,474.72x = 123,444,200.72
5. Step 5: Solve for x
   x = 123,444,200.72/12,474.72
6. Step 6: Final answer
   x = 9,895.55