Finding the Fourth Proportional to 13,216.46, 18,238.92 and 7,911.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,216.46 : 18,238.92 = 7,911.50 : x
2. Step 2: Convert to fraction form
   13,216.46/18,238.92 = 7,911.50/x
3. Step 3: Cross multiply
   13,216.46x = 18,238.92 × 7,911.50
4. Step 4: Simplify right side
   13,216.46x = 144,297,215.58
5. Step 5: Solve for x
   x = 144,297,215.58/13,216.46
6. Step 6: Final answer
   x = 10,917.99