Finding the Fourth Proportional to 9,660.63, 13,326.80 and 5,679.21

Step by Step Solution

1. Step 1: Write the proportion equation
   9,660.63 : 13,326.80 = 5,679.21 : x
2. Step 2: Convert to fraction form
   9,660.63/13,326.80 = 5,679.21/x
3. Step 3: Cross multiply
   9,660.63x = 13,326.80 × 5,679.21
4. Step 4: Simplify right side
   9,660.63x = 75,685,667.43
5. Step 5: Solve for x
   x = 75,685,667.43/9,660.63
6. Step 6: Final answer
   x = 7,834.44