Finding the Fourth Proportional to 8,540.79, 11,784.78 and 5,137.89

Step by Step Solution

1. Step 1: Write the proportion equation
   8,540.79 : 11,784.78 = 5,137.89 : x
2. Step 2: Convert to fraction form
   8,540.79/11,784.78 = 5,137.89/x
3. Step 3: Cross multiply
   8,540.79x = 11,784.78 × 5,137.89
4. Step 4: Simplify right side
   8,540.79x = 60,548,903.31
5. Step 5: Solve for x
   x = 60,548,903.31/8,540.79
6. Step 6: Final answer
   x = 7,089.38