Finding the Fourth Proportional to 9,678.65, 13,355.69 and 5,371.88

Step by Step Solution

1. Step 1: Write the proportion equation
   9,678.65 : 13,355.69 = 5,371.88 : x
2. Step 2: Convert to fraction form
   9,678.65/13,355.69 = 5,371.88/x
3. Step 3: Cross multiply
   9,678.65x = 13,355.69 × 5,371.88
4. Step 4: Simplify right side
   9,678.65x = 71,745,070.36
5. Step 5: Solve for x
   x = 71,745,070.36/9,678.65
6. Step 6: Final answer
   x = 7,412.72