Finding the Fourth Proportional to 11,725.72, 17,590.32 and 3,405.81

Step by Step Solution

1. Step 1: Write the proportion equation
   11,725.72 : 17,590.32 = 3,405.81 : x
2. Step 2: Convert to fraction form
   11,725.72/17,590.32 = 3,405.81/x
3. Step 3: Cross multiply
   11,725.72x = 17,590.32 × 3,405.81
4. Step 4: Simplify right side
   11,725.72x = 59,909,287.76
5. Step 5: Solve for x
   x = 59,909,287.76/11,725.72
6. Step 6: Final answer
   x = 5,109.22