Finding the Fourth Proportional to 9,897.60, 13,658.70 and 5,421.52

Step by Step Solution

1. Step 1: Write the proportion equation
   9,897.60 : 13,658.70 = 5,421.52 : x
2. Step 2: Convert to fraction form
   9,897.60/13,658.70 = 5,421.52/x
3. Step 3: Cross multiply
   9,897.60x = 13,658.70 × 5,421.52
4. Step 4: Simplify right side
   9,897.60x = 74,050,915.22
5. Step 5: Solve for x
   x = 74,050,915.22/9,897.60
6. Step 6: Final answer
   x = 7,481.70