Finding the Fourth Proportional to 8,921.52, 12,311.72 and 4,942.60

Step by Step Solution

1. Step 1: Write the proportion equation
   8,921.52 : 12,311.72 = 4,942.60 : x
2. Step 2: Convert to fraction form
   8,921.52/12,311.72 = 4,942.60/x
3. Step 3: Cross multiply
   8,921.52x = 12,311.72 × 4,942.60
4. Step 4: Simplify right side
   8,921.52x = 60,851,907.27
5. Step 5: Solve for x
   x = 60,851,907.27/8,921.52
6. Step 6: Final answer
   x = 6,820.80