Finding the Fourth Proportional to 12,471.61, 17,213.78 and 7,169.51

Step by Step Solution

1. Step 1: Write the proportion equation
   12,471.61 : 17,213.78 = 7,169.51 : x
2. Step 2: Convert to fraction form
   12,471.61/17,213.78 = 7,169.51/x
3. Step 3: Cross multiply
   12,471.61x = 17,213.78 × 7,169.51
4. Step 4: Simplify right side
   12,471.61x = 123,414,245.93
5. Step 5: Solve for x
   x = 123,414,245.93/12,471.61
6. Step 6: Final answer
   x = 9,895.61