Finding the Fourth Proportional to 9,144.84, 12,620.16 and 5,166.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,144.84 : 12,620.16 = 5,166.12 : x
2. Step 2: Convert to fraction form
   9,144.84/12,620.16 = 5,166.12/x
3. Step 3: Cross multiply
   9,144.84x = 12,620.16 × 5,166.12
4. Step 4: Simplify right side
   9,144.84x = 65,197,260.98
5. Step 5: Solve for x
   x = 65,197,260.98/9,144.84
6. Step 6: Final answer
   x = 7,129.40