Finding the Fourth Proportional to 9,620.02, 13,275.93 and 5,428.54

Step by Step Solution

1. Step 1: Write the proportion equation
   9,620.02 : 13,275.93 = 5,428.54 : x
2. Step 2: Convert to fraction form
   9,620.02/13,275.93 = 5,428.54/x
3. Step 3: Cross multiply
   9,620.02x = 13,275.93 × 5,428.54
4. Step 4: Simplify right side
   9,620.02x = 72,068,917.04
5. Step 5: Solve for x
   x = 72,068,917.04/9,620.02
6. Step 6: Final answer
   x = 7,491.56