Finding the Fourth Proportional to 9,620.84, 13,276.74 and 5,429.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,620.84 : 13,276.74 = 5,429.12 : x
2. Step 2: Convert to fraction form
   9,620.84/13,276.74 = 5,429.12/x
3. Step 3: Cross multiply
   9,620.84x = 13,276.74 × 5,429.12
4. Step 4: Simplify right side
   9,620.84x = 72,081,014.67
5. Step 5: Solve for x
   x = 72,081,014.67/9,620.84
6. Step 6: Final answer
   x = 7,492.17