Finding the Fourth Proportional to 11,639.34, 17,456.18 and 3,320.10

Step by Step Solution

1. Step 1: Write the proportion equation
   11,639.34 : 17,456.18 = 3,320.10 : x
2. Step 2: Convert to fraction form
   11,639.34/17,456.18 = 3,320.10/x
3. Step 3: Cross multiply
   11,639.34x = 17,456.18 × 3,320.10
4. Step 4: Simplify right side
   11,639.34x = 57,956,246.62
5. Step 5: Solve for x
   x = 57,956,246.62/11,639.34
6. Step 6: Final answer
   x = 4,979.34