Finding the Fourth Proportional to 9,520.81, 13,139.21 and 5,272.34

Step by Step Solution

1. Step 1: Write the proportion equation
   9,520.81 : 13,139.21 = 5,272.34 : x
2. Step 2: Convert to fraction form
   9,520.81/13,139.21 = 5,272.34/x
3. Step 3: Cross multiply
   9,520.81x = 13,139.21 × 5,272.34
4. Step 4: Simplify right side
   9,520.81x = 69,274,290.39
5. Step 5: Solve for x
   x = 69,274,290.39/9,520.81
6. Step 6: Final answer
   x = 7,276.09