Finding the Fourth Proportional to 9,621.42, 13,277.52 and 5,429.64

Step by Step Solution

1. Step 1: Write the proportion equation
   9,621.42 : 13,277.52 = 5,429.64 : x
2. Step 2: Convert to fraction form
   9,621.42/13,277.52 = 5,429.64/x
3. Step 3: Cross multiply
   9,621.42x = 13,277.52 × 5,429.64
4. Step 4: Simplify right side
   9,621.42x = 72,092,153.69
5. Step 5: Solve for x
   x = 72,092,153.69/9,621.42
6. Step 6: Final answer
   x = 7,492.88