Finding the Fourth Proportional to 9,678.33, 13,355.40 and 5,429.07

Step by Step Solution

1. Step 1: Write the proportion equation
   9,678.33 : 13,355.40 = 5,429.07 : x
2. Step 2: Convert to fraction form
   9,678.33/13,355.40 = 5,429.07/x
3. Step 3: Cross multiply
   9,678.33x = 13,355.40 × 5,429.07
4. Step 4: Simplify right side
   9,678.33x = 72,507,401.48
5. Step 5: Solve for x
   x = 72,507,401.48/9,678.33
6. Step 6: Final answer
   x = 7,491.73