Finding the Fourth Proportional to 12,921.81, 17,833.47 and 8,206.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,921.81 : 17,833.47 = 8,206.10 : x
2. Step 2: Convert to fraction form
   12,921.81/17,833.47 = 8,206.10/x
3. Step 3: Cross multiply
   12,921.81x = 17,833.47 × 8,206.10
4. Step 4: Simplify right side
   12,921.81x = 146,343,238.17
5. Step 5: Solve for x
   x = 146,343,238.17/12,921.81
6. Step 6: Final answer
   x = 11,325.29