Finding the Fourth Proportional to 13,314.65, 18,240.86 and 12,816.09

Step by Step Solution

1. Step 1: Write the proportion equation
   13,314.65 : 18,240.86 = 12,816.09 : x
2. Step 2: Convert to fraction form
   13,314.65/18,240.86 = 12,816.09/x
3. Step 3: Cross multiply
   13,314.65x = 18,240.86 × 12,816.09
4. Step 4: Simplify right side
   13,314.65x = 233,776,535.48
5. Step 5: Solve for x
   x = 233,776,535.48/13,314.65
6. Step 6: Final answer
   x = 17,557.85