Finding the Fourth Proportional to 11,388.06, 17,085.33 and 3,993.30

Step by Step Solution

1. Step 1: Write the proportion equation
   11,388.06 : 17,085.33 = 3,993.30 : x
2. Step 2: Convert to fraction form
   11,388.06/17,085.33 = 3,993.30/x
3. Step 3: Cross multiply
   11,388.06x = 17,085.33 × 3,993.30
4. Step 4: Simplify right side
   11,388.06x = 68,226,848.29
5. Step 5: Solve for x
   x = 68,226,848.29/11,388.06
6. Step 6: Final answer
   x = 5,991.09