Finding the Fourth Proportional to 11,603.72, 17,409.18 and 4,211.72

Step by Step Solution

1. Step 1: Write the proportion equation
   11,603.72 : 17,409.18 = 4,211.72 : x
2. Step 2: Convert to fraction form
   11,603.72/17,409.18 = 4,211.72/x
3. Step 3: Cross multiply
   11,603.72x = 17,409.18 × 4,211.72
4. Step 4: Simplify right side
   11,603.72x = 73,322,591.59
5. Step 5: Solve for x
   x = 73,322,591.59/11,603.72
6. Step 6: Final answer
   x = 6,318.89