Finding the Fourth Proportional to 9,897.62, 13,658.72 and 5,421.65

Step by Step Solution

1. Step 1: Write the proportion equation
   9,897.62 : 13,658.72 = 5,421.65 : x
2. Step 2: Convert to fraction form
   9,897.62/13,658.72 = 5,421.65/x
3. Step 3: Cross multiply
   9,897.62x = 13,658.72 × 5,421.65
4. Step 4: Simplify right side
   9,897.62x = 74,052,799.29
5. Step 5: Solve for x
   x = 74,052,799.29/9,897.62
6. Step 6: Final answer
   x = 7,481.88