Finding the Fourth Proportional to 9,521.98, 13,138.58 and 5,488.07

Step by Step Solution

1. Step 1: Write the proportion equation
   9,521.98 : 13,138.58 = 5,488.07 : x
2. Step 2: Convert to fraction form
   9,521.98/13,138.58 = 5,488.07/x
3. Step 3: Cross multiply
   9,521.98x = 13,138.58 × 5,488.07
4. Step 4: Simplify right side
   9,521.98x = 72,105,452.15
5. Step 5: Solve for x
   x = 72,105,452.15/9,521.98
6. Step 6: Final answer
   x = 7,572.53