Finding the Fourth Proportional to 9,144.70, 12,618.99 and 5,166.18

Step by Step Solution

1. Step 1: Write the proportion equation
   9,144.70 : 12,618.99 = 5,166.18 : x
2. Step 2: Convert to fraction form
   9,144.70/12,618.99 = 5,166.18/x
3. Step 3: Cross multiply
   9,144.70x = 12,618.99 × 5,166.18
4. Step 4: Simplify right side
   9,144.70x = 65,191,973.76
5. Step 5: Solve for x
   x = 65,191,973.76/9,144.70
6. Step 6: Final answer
   x = 7,128.94