Finding the Fourth Proportional to 8,957.37, 12,359.79 and 4,978.47

Step by Step Solution

1. Step 1: Write the proportion equation
   8,957.37 : 12,359.79 = 4,978.47 : x
2. Step 2: Convert to fraction form
   8,957.37/12,359.79 = 4,978.47/x
3. Step 3: Cross multiply
   8,957.37x = 12,359.79 × 4,978.47
4. Step 4: Simplify right side
   8,957.37x = 61,532,843.72
5. Step 5: Solve for x
   x = 61,532,843.72/8,957.37
6. Step 6: Final answer
   x = 6,869.52