Finding the Fourth Proportional to 9,520.79, 13,139.34 and 5,272.03

Step by Step Solution

1. Step 1: Write the proportion equation
   9,520.79 : 13,139.34 = 5,272.03 : x
2. Step 2: Convert to fraction form
   9,520.79/13,139.34 = 5,272.03/x
3. Step 3: Cross multiply
   9,520.79x = 13,139.34 × 5,272.03
4. Step 4: Simplify right side
   9,520.79x = 69,270,928.96
5. Step 5: Solve for x
   x = 69,270,928.96/9,520.79
6. Step 6: Final answer
   x = 7,275.75