Finding the Fourth Proportional to 17,679.50, 24,397.68 and 10,128.28

Step by Step Solution

1. Step 1: Write the proportion equation
   17,679.50 : 24,397.68 = 10,128.28 : x
2. Step 2: Convert to fraction form
   17,679.50/24,397.68 = 10,128.28/x
3. Step 3: Cross multiply
   17,679.50x = 24,397.68 × 10,128.28
4. Step 4: Simplify right side
   17,679.50x = 247,106,473.40
5. Step 5: Solve for x
   x = 247,106,473.40/17,679.50
6. Step 6: Final answer
   x = 13,977.00