Finding the Fourth Proportional to 9,663.57, 13,343.27 and 7,421.90

Step by Step Solution

1. Step 1: Write the proportion equation
   9,663.57 : 13,343.27 = 7,421.90 : x
2. Step 2: Convert to fraction form
   9,663.57/13,343.27 = 7,421.90/x
3. Step 3: Cross multiply
   9,663.57x = 13,343.27 × 7,421.90
4. Step 4: Simplify right side
   9,663.57x = 99,032,311.79
5. Step 5: Solve for x
   x = 99,032,311.79/9,663.57
6. Step 6: Final answer
   x = 10,248.00