Finding the Fourth Proportional to 9,620.25, 13,276.35 and 5,428.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,620.25 : 13,276.35 = 5,428.50 : x
2. Step 2: Convert to fraction form
   9,620.25/13,276.35 = 5,428.50/x
3. Step 3: Cross multiply
   9,620.25x = 13,276.35 × 5,428.50
4. Step 4: Simplify right side
   9,620.25x = 72,070,665.98
5. Step 5: Solve for x
   x = 72,070,665.98/9,620.25
6. Step 6: Final answer
   x = 7,491.56