Finding the Fourth Proportional to 9,676.86, 13,353.48 and 5,428.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,676.86 : 13,353.48 = 5,428.50 : x
2. Step 2: Convert to fraction form
   9,676.86/13,353.48 = 5,428.50/x
3. Step 3: Cross multiply
   9,676.86x = 13,353.48 × 5,428.50
4. Step 4: Simplify right side
   9,676.86x = 72,489,366.18
5. Step 5: Solve for x
   x = 72,489,366.18/9,676.86
6. Step 6: Final answer
   x = 7,491.00