Finding the Fourth Proportional to 11,783.79, 16,261.50 and 6,478.86

Step by Step Solution

1. Step 1: Write the proportion equation
   11,783.79 : 16,261.50 = 6,478.86 : x
2. Step 2: Convert to fraction form
   11,783.79/16,261.50 = 6,478.86/x
3. Step 3: Cross multiply
   11,783.79x = 16,261.50 × 6,478.86
4. Step 4: Simplify right side
   11,783.79x = 105,355,981.89
5. Step 5: Solve for x
   x = 105,355,981.89/11,783.79
6. Step 6: Final answer
   x = 8,940.76