Finding the Fourth Proportional to 9,621.40, 13,277.49 and 5,429.65

Step by Step Solution

1. Step 1: Write the proportion equation
   9,621.40 : 13,277.49 = 5,429.65 : x
2. Step 2: Convert to fraction form
   9,621.40/13,277.49 = 5,429.65/x
3. Step 3: Cross multiply
   9,621.40x = 13,277.49 × 5,429.65
4. Step 4: Simplify right side
   9,621.40x = 72,092,123.58
5. Step 5: Solve for x
   x = 72,092,123.58/9,621.40
6. Step 6: Final answer
   x = 7,492.89