Finding the Fourth Proportional to 9,676.31, 13,353.84 and 5,428.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,676.31 : 13,353.84 = 5,428.72 : x
2. Step 2: Convert to fraction form
   9,676.31/13,353.84 = 5,428.72/x
3. Step 3: Cross multiply
   9,676.31x = 13,353.84 × 5,428.72
4. Step 4: Simplify right side
   9,676.31x = 72,494,265.07
5. Step 5: Solve for x
   x = 72,494,265.07/9,676.31
6. Step 6: Final answer
   x = 7,491.93