Finding the Fourth Proportional to 12,611.52, 17,405.94 and 9,621.69

Step by Step Solution

1. Step 1: Write the proportion equation
   12,611.52 : 17,405.94 = 9,621.69 : x
2. Step 2: Convert to fraction form
   12,611.52/17,405.94 = 9,621.69/x
3. Step 3: Cross multiply
   12,611.52x = 17,405.94 × 9,621.69
4. Step 4: Simplify right side
   12,611.52x = 167,474,558.84
5. Step 5: Solve for x
   x = 167,474,558.84/12,611.52
6. Step 6: Final answer
   x = 13,279.49