Finding the Fourth Proportional to 54,111.76, 80,771.37 and 47,720.30

Step by Step Solution

1. Step 1: Write the proportion equation
   54,111.76 : 80,771.37 = 47,720.30 : x
2. Step 2: Convert to fraction form
   54,111.76/80,771.37 = 47,720.30/x
3. Step 3: Cross multiply
   54,111.76x = 80,771.37 × 47,720.30
4. Step 4: Simplify right side
   54,111.76x = 3,854,434,007.81
5. Step 5: Solve for x
   x = 3,854,434,007.81/54,111.76
6. Step 6: Final answer
   x = 71,230.99