Finding the Fourth Proportional to 11,386.61, 17,069.49 and 3,987.03

Step by Step Solution

1. Step 1: Write the proportion equation
   11,386.61 : 17,069.49 = 3,987.03 : x
2. Step 2: Convert to fraction form
   11,386.61/17,069.49 = 3,987.03/x
3. Step 3: Cross multiply
   11,386.61x = 17,069.49 × 3,987.03
4. Step 4: Simplify right side
   11,386.61x = 68,056,568.71
5. Step 5: Solve for x
   x = 68,056,568.71/11,386.61
6. Step 6: Final answer
   x = 5,976.90