Finding the Fourth Proportional to 17,679.35, 24,398.16 and 9,721.40

Step by Step Solution

1. Step 1: Write the proportion equation
   17,679.35 : 24,398.16 = 9,721.40 : x
2. Step 2: Convert to fraction form
   17,679.35/24,398.16 = 9,721.40/x
3. Step 3: Cross multiply
   17,679.35x = 24,398.16 × 9,721.40
4. Step 4: Simplify right side
   17,679.35x = 237,184,150.63
5. Step 5: Solve for x
   x = 237,184,150.63/17,679.35
6. Step 6: Final answer
   x = 13,415.89