Finding the Fourth Proportional to 11,722.90, 17,581.59 and 3,400.72

Step by Step Solution

1. Step 1: Write the proportion equation
   11,722.90 : 17,581.59 = 3,400.72 : x
2. Step 2: Convert to fraction form
   11,722.90/17,581.59 = 3,400.72/x
3. Step 3: Cross multiply
   11,722.90x = 17,581.59 × 3,400.72
4. Step 4: Simplify right side
   11,722.90x = 59,790,064.74
5. Step 5: Solve for x
   x = 59,790,064.74/11,722.90
6. Step 6: Final answer
   x = 5,100.28