Finding the Fourth Proportional to 9,620.34, 13,276.44 and 5,428.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,620.34 : 13,276.44 = 5,428.50 : x
2. Step 2: Convert to fraction form
   9,620.34/13,276.44 = 5,428.50/x
3. Step 3: Cross multiply
   9,620.34x = 13,276.44 × 5,428.50
4. Step 4: Simplify right side
   9,620.34x = 72,071,154.54
5. Step 5: Solve for x
   x = 72,071,154.54/9,620.34
6. Step 6: Final answer
   x = 7,491.54