Finding the Fourth Proportional to 17,658, 26,496.72 and 8,424

Step by Step Solution

1. Step 1: Write the proportion equation
   17,658 : 26,496.72 = 8,424 : x
2. Step 2: Convert to fraction form
   17,658/26,496.72 = 8,424/x
3. Step 3: Cross multiply
   17,658x = 26,496.72 × 8,424
4. Step 4: Simplify right side
   17,658x = 223,208,369.28
5. Step 5: Solve for x
   x = 223,208,369.28/17,658
6. Step 6: Final answer
   x = 12,640.64