Finding the Fourth Proportional to 9,620.58, 13,277.49 and 5,428.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,620.58 : 13,277.49 = 5,428.50 : x
2. Step 2: Convert to fraction form
   9,620.58/13,277.49 = 5,428.50/x
3. Step 3: Cross multiply
   9,620.58x = 13,277.49 × 5,428.50
4. Step 4: Simplify right side
   9,620.58x = 72,076,854.47
5. Step 5: Solve for x
   x = 72,076,854.47/9,620.58
6. Step 6: Final answer
   x = 7,491.94