Finding the Fourth Proportional to 11,987.57, 17,967.23 and 5,406.05

Step by Step Solution

1. Step 1: Write the proportion equation
   11,987.57 : 17,967.23 = 5,406.05 : x
2. Step 2: Convert to fraction form
   11,987.57/17,967.23 = 5,406.05/x
3. Step 3: Cross multiply
   11,987.57x = 17,967.23 × 5,406.05
4. Step 4: Simplify right side
   11,987.57x = 97,131,743.74
5. Step 5: Solve for x
   x = 97,131,743.74/11,987.57
6. Step 6: Final answer
   x = 8,102.71