Finding the Fourth Proportional to 47,928.15, 71,897.49 and 12,870.54

Step by Step Solution

1. Step 1: Write the proportion equation
   47,928.15 : 71,897.49 = 12,870.54 : x
2. Step 2: Convert to fraction form
   47,928.15/71,897.49 = 12,870.54/x
3. Step 3: Cross multiply
   47,928.15x = 71,897.49 × 12,870.54
4. Step 4: Simplify right side
   47,928.15x = 925,359,520.94
5. Step 5: Solve for x
   x = 925,359,520.94/47,928.15
6. Step 6: Final answer
   x = 19,307.22