Finding the Fourth Proportional to 9,508.76, 13,121.85 and 5,259.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,508.76 : 13,121.85 = 5,259.72 : x
2. Step 2: Convert to fraction form
   9,508.76/13,121.85 = 5,259.72/x
3. Step 3: Cross multiply
   9,508.76x = 13,121.85 × 5,259.72
4. Step 4: Simplify right side
   9,508.76x = 69,017,256.88
5. Step 5: Solve for x
   x = 69,017,256.88/9,508.76
6. Step 6: Final answer
   x = 7,258.28