Finding the Fourth Proportional to 9,678.29, 13,357.56 and 5,431.07

Step by Step Solution

1. Step 1: Write the proportion equation
   9,678.29 : 13,357.56 = 5,431.07 : x
2. Step 2: Convert to fraction form
   9,678.29/13,357.56 = 5,431.07/x
3. Step 3: Cross multiply
   9,678.29x = 13,357.56 × 5,431.07
4. Step 4: Simplify right side
   9,678.29x = 72,545,843.39
5. Step 5: Solve for x
   x = 72,545,843.39/9,678.29
6. Step 6: Final answer
   x = 7,495.73