Finding the Fourth Proportional to 9,620.22, 13,276 and 5,428.56

Step by Step Solution

1. Step 1: Write the proportion equation
   9,620.22 : 13,276 = 5,428.56 : x
2. Step 2: Convert to fraction form
   9,620.22/13,276 = 5,428.56/x
3. Step 3: Cross multiply
   9,620.22x = 13,276 × 5,428.56
4. Step 4: Simplify right side
   9,620.22x = 72,069,562.56
5. Step 5: Solve for x
   x = 72,069,562.56/9,620.22
6. Step 6: Final answer
   x = 7,491.47