Finding the Fourth Proportional to 9,687.79, 13,369.58 and 5,709.07

Step by Step Solution

1. Step 1: Write the proportion equation
   9,687.79 : 13,369.58 = 5,709.07 : x
2. Step 2: Convert to fraction form
   9,687.79/13,369.58 = 5,709.07/x
3. Step 3: Cross multiply
   9,687.79x = 13,369.58 × 5,709.07
4. Step 4: Simplify right side
   9,687.79x = 76,327,815.52
5. Step 5: Solve for x
   x = 76,327,815.52/9,687.79
6. Step 6: Final answer
   x = 7,878.77