Finding the Fourth Proportional to 31,780, 43,856.37 and 17,439.91

Step by Step Solution

1. Step 1: Write the proportion equation
   31,780 : 43,856.37 = 17,439.91 : x
2. Step 2: Convert to fraction form
   31,780/43,856.37 = 17,439.91/x
3. Step 3: Cross multiply
   31,780x = 43,856.37 × 17,439.91
4. Step 4: Simplify right side
   31,780x = 764,851,145.73
5. Step 5: Solve for x
   x = 764,851,145.73/31,780
6. Step 6: Final answer
   x = 24,067.06