Finding the Fourth Proportional to 10,238, 14,118 and 9,642.80

Step by Step Solution

1. Step 1: Write the proportion equation
   10,238 : 14,118 = 9,642.80 : x
2. Step 2: Convert to fraction form
   10,238/14,118 = 9,642.80/x
3. Step 3: Cross multiply
   10,238x = 14,118 × 9,642.80
4. Step 4: Simplify right side
   10,238x = 136,137,050.40
5. Step 5: Solve for x
   x = 136,137,050.40/10,238
6. Step 6: Final answer
   x = 13,297.23