Finding the Fourth Proportional to 11,905.91, 17,858.15 and 3,585.72

Step by Step Solution

1. Step 1: Write the proportion equation
   11,905.91 : 17,858.15 = 3,585.72 : x
2. Step 2: Convert to fraction form
   11,905.91/17,858.15 = 3,585.72/x
3. Step 3: Cross multiply
   11,905.91x = 17,858.15 × 3,585.72
4. Step 4: Simplify right side
   11,905.91x = 64,034,325.62
5. Step 5: Solve for x
   x = 64,034,325.62/11,905.91
6. Step 6: Final answer
   x = 5,378.36