Finding the Fourth Proportional to 31,912.35, 47,868.50 and 8,538.18

Step by Step Solution

1. Step 1: Write the proportion equation
   31,912.35 : 47,868.50 = 8,538.18 : x
2. Step 2: Convert to fraction form
   31,912.35/47,868.50 = 8,538.18/x
3. Step 3: Cross multiply
   31,912.35x = 47,868.50 × 8,538.18
4. Step 4: Simplify right side
   31,912.35x = 408,709,826.64
5. Step 5: Solve for x
   x = 408,709,826.64/31,912.35
6. Step 6: Final answer
   x = 12,807.26