Finding the Fourth Proportional to 9,521.72, 13,139.90 and 5,330.04

Step by Step Solution

1. Step 1: Write the proportion equation
   9,521.72 : 13,139.90 = 5,330.04 : x
2. Step 2: Convert to fraction form
   9,521.72/13,139.90 = 5,330.04/x
3. Step 3: Cross multiply
   9,521.72x = 13,139.90 × 5,330.04
4. Step 4: Simplify right side
   9,521.72x = 70,036,192.60
5. Step 5: Solve for x
   x = 70,036,192.60/9,521.72
6. Step 6: Final answer
   x = 7,355.41