Finding the Fourth Proportional to 11,611.56, 17,411.94 and 4,215.72

Step by Step Solution

1. Step 1: Write the proportion equation
   11,611.56 : 17,411.94 = 4,215.72 : x
2. Step 2: Convert to fraction form
   11,611.56/17,411.94 = 4,215.72/x
3. Step 3: Cross multiply
   11,611.56x = 17,411.94 × 4,215.72
4. Step 4: Simplify right side
   11,611.56x = 73,403,863.70
5. Step 5: Solve for x
   x = 73,403,863.70/11,611.56
6. Step 6: Final answer
   x = 6,321.62