Finding the Fourth Proportional to 12,238.61, 16,870.68 and 9,581.40

Step by Step Solution

1. Step 1: Write the proportion equation
   12,238.61 : 16,870.68 = 9,581.40 : x
2. Step 2: Convert to fraction form
   12,238.61/16,870.68 = 9,581.40/x
3. Step 3: Cross multiply
   12,238.61x = 16,870.68 × 9,581.40
4. Step 4: Simplify right side
   12,238.61x = 161,644,733.35
5. Step 5: Solve for x
   x = 161,644,733.35/12,238.61
6. Step 6: Final answer
   x = 13,207.77