Finding the Fourth Proportional to 12,488.90, 17,238.30 and 8,243.06

Step by Step Solution

1. Step 1: Write the proportion equation
   12,488.90 : 17,238.30 = 8,243.06 : x
2. Step 2: Convert to fraction form
   12,488.90/17,238.30 = 8,243.06/x
3. Step 3: Cross multiply
   12,488.90x = 17,238.30 × 8,243.06
4. Step 4: Simplify right side
   12,488.90x = 142,096,341.20
5. Step 5: Solve for x
   x = 142,096,341.20/12,488.90
6. Step 6: Final answer
   x = 11,377.81