Finding the Fourth Proportional to 9,631.88, 13,291.80 and 5,440.04

Step by Step Solution

1. Step 1: Write the proportion equation
   9,631.88 : 13,291.80 = 5,440.04 : x
2. Step 2: Convert to fraction form
   9,631.88/13,291.80 = 5,440.04/x
3. Step 3: Cross multiply
   9,631.88x = 13,291.80 × 5,440.04
4. Step 4: Simplify right side
   9,631.88x = 72,307,923.67
5. Step 5: Solve for x
   x = 72,307,923.67/9,631.88
6. Step 6: Final answer
   x = 7,507.15