Finding the Fourth Proportional to 9,619.74, 13,275.46 and 5,428.26

Step by Step Solution

1. Step 1: Write the proportion equation
   9,619.74 : 13,275.46 = 5,428.26 : x
2. Step 2: Convert to fraction form
   9,619.74/13,275.46 = 5,428.26/x
3. Step 3: Cross multiply
   9,619.74x = 13,275.46 × 5,428.26
4. Step 4: Simplify right side
   9,619.74x = 72,062,648.50
5. Step 5: Solve for x
   x = 72,062,648.50/9,619.74
6. Step 6: Final answer
   x = 7,491.12