Finding the Fourth Proportional to 11,985.61, 18,008.15 and 7,771.54

Step by Step Solution

1. Step 1: Write the proportion equation
   11,985.61 : 18,008.15 = 7,771.54 : x
2. Step 2: Convert to fraction form
   11,985.61/18,008.15 = 7,771.54/x
3. Step 3: Cross multiply
   11,985.61x = 18,008.15 × 7,771.54
4. Step 4: Simplify right side
   11,985.61x = 139,951,041.72
5. Step 5: Solve for x
   x = 139,951,041.72/11,985.61
6. Step 6: Final answer
   x = 11,676.58