Finding the Fourth Proportional to 11,783.76, 17,680.18 and 3,992.54

Step by Step Solution

1. Step 1: Write the proportion equation
   11,783.76 : 17,680.18 = 3,992.54 : x
2. Step 2: Convert to fraction form
   11,783.76/17,680.18 = 3,992.54/x
3. Step 3: Cross multiply
   11,783.76x = 17,680.18 × 3,992.54
4. Step 4: Simplify right side
   11,783.76x = 70,588,825.86
5. Step 5: Solve for x
   x = 70,588,825.86/11,783.76
6. Step 6: Final answer
   x = 5,990.35