Finding the Fourth Proportional to 9,620.76, 13,276.38 and 5,429.40

Step by Step Solution

1. Step 1: Write the proportion equation
   9,620.76 : 13,276.38 = 5,429.40 : x
2. Step 2: Convert to fraction form
   9,620.76/13,276.38 = 5,429.40/x
3. Step 3: Cross multiply
   9,620.76x = 13,276.38 × 5,429.40
4. Step 4: Simplify right side
   9,620.76x = 72,082,777.57
5. Step 5: Solve for x
   x = 72,082,777.57/9,620.76
6. Step 6: Final answer
   x = 7,492.42