Finding the Fourth Proportional to 12,904.65, 17,812.20 and 8,429.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,904.65 : 17,812.20 = 8,429.10 : x
2. Step 2: Convert to fraction form
   12,904.65/17,812.20 = 8,429.10/x
3. Step 3: Cross multiply
   12,904.65x = 17,812.20 × 8,429.10
4. Step 4: Simplify right side
   12,904.65x = 150,140,815.02
5. Step 5: Solve for x
   x = 150,140,815.02/12,904.65
6. Step 6: Final answer
   x = 11,634.63