Finding the Fourth Proportional to 31,308.20, 43,205.31 and 17,160.74

Step by Step Solution

1. Step 1: Write the proportion equation
   31,308.20 : 43,205.31 = 17,160.74 : x
2. Step 2: Convert to fraction form
   31,308.20/43,205.31 = 17,160.74/x
3. Step 3: Cross multiply
   31,308.20x = 43,205.31 × 17,160.74
4. Step 4: Simplify right side
   31,308.20x = 741,434,875.50
5. Step 5: Solve for x
   x = 741,434,875.50/31,308.20
6. Step 6: Final answer
   x = 23,681.81