Finding the Fourth Proportional to 11,775.86, 17,667.12 and 3,985.28

Step by Step Solution

1. Step 1: Write the proportion equation
   11,775.86 : 17,667.12 = 3,985.28 : x
2. Step 2: Convert to fraction form
   11,775.86/17,667.12 = 3,985.28/x
3. Step 3: Cross multiply
   11,775.86x = 17,667.12 × 3,985.28
4. Step 4: Simplify right side
   11,775.86x = 70,408,419.99
5. Step 5: Solve for x
   x = 70,408,419.99/11,775.86
6. Step 6: Final answer
   x = 5,979.05