Finding the Fourth Proportional to 9,145.98, 12,619.98 and 5,166.99

Step by Step Solution

1. Step 1: Write the proportion equation
   9,145.98 : 12,619.98 = 5,166.99 : x
2. Step 2: Convert to fraction form
   9,145.98/12,619.98 = 5,166.99/x
3. Step 3: Cross multiply
   9,145.98x = 12,619.98 × 5,166.99
4. Step 4: Simplify right side
   9,145.98x = 65,207,310.46
5. Step 5: Solve for x
   x = 65,207,310.46/9,145.98
6. Step 6: Final answer
   x = 7,129.61