Finding the Fourth Proportional to 9,679.59, 13,356.74 and 5,429.77

Step by Step Solution

1. Step 1: Write the proportion equation
   9,679.59 : 13,356.74 = 5,429.77 : x
2. Step 2: Convert to fraction form
   9,679.59/13,356.74 = 5,429.77/x
3. Step 3: Cross multiply
   9,679.59x = 13,356.74 × 5,429.77
4. Step 4: Simplify right side
   9,679.59x = 72,524,006.33
5. Step 5: Solve for x
   x = 72,524,006.33/9,679.59
6. Step 6: Final answer
   x = 7,492.47