Finding the Fourth Proportional to 47,139.53, 70,709.27 and 13,859.87

Step by Step Solution

1. Step 1: Write the proportion equation
   47,139.53 : 70,709.27 = 13,859.87 : x
2. Step 2: Convert to fraction form
   47,139.53/70,709.27 = 13,859.87/x
3. Step 3: Cross multiply
   47,139.53x = 70,709.27 × 13,859.87
4. Step 4: Simplify right side
   47,139.53x = 980,020,867.15
5. Step 5: Solve for x
   x = 980,020,867.15/47,139.53
6. Step 6: Final answer
   x = 20,789.79