Finding the Fourth Proportional to 9,521.34, 13,137.75 and 5,328.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,521.34 : 13,137.75 = 5,328.78 : x
2. Step 2: Convert to fraction form
   9,521.34/13,137.75 = 5,328.78/x
3. Step 3: Cross multiply
   9,521.34x = 13,137.75 × 5,328.78
4. Step 4: Simplify right side
   9,521.34x = 70,008,179.45
5. Step 5: Solve for x
   x = 70,008,179.45/9,521.34
6. Step 6: Final answer
   x = 7,352.77