Finding the Fourth Proportional to 9,233.68, 12,738.72 and 6,440.80

Step by Step Solution

1. Step 1: Write the proportion equation
   9,233.68 : 12,738.72 = 6,440.80 : x
2. Step 2: Convert to fraction form
   9,233.68/12,738.72 = 6,440.80/x
3. Step 3: Cross multiply
   9,233.68x = 12,738.72 × 6,440.80
4. Step 4: Simplify right side
   9,233.68x = 82,047,547.78
5. Step 5: Solve for x
   x = 82,047,547.78/9,233.68
6. Step 6: Final answer
   x = 8,885.68