Finding the Fourth Proportional to 17,178.72, 23,705.04 and 9,726.72

Step by Step Solution

1. Step 1: Write the proportion equation
   17,178.72 : 23,705.04 = 9,726.72 : x
2. Step 2: Convert to fraction form
   17,178.72/23,705.04 = 9,726.72/x
3. Step 3: Cross multiply
   17,178.72x = 23,705.04 × 9,726.72
4. Step 4: Simplify right side
   17,178.72x = 230,572,286.67
5. Step 5: Solve for x
   x = 230,572,286.67/17,178.72
6. Step 6: Final answer
   x = 13,421.97