Finding the Fourth Proportional to 31,315.60, 43,215.30 and 17,168.20

Step by Step Solution

1. Step 1: Write the proportion equation
   31,315.60 : 43,215.30 = 17,168.20 : x
2. Step 2: Convert to fraction form
   31,315.60/43,215.30 = 17,168.20/x
3. Step 3: Cross multiply
   31,315.60x = 43,215.30 × 17,168.20
4. Step 4: Simplify right side
   31,315.60x = 741,928,913.46
5. Step 5: Solve for x
   x = 741,928,913.46/31,315.60
6. Step 6: Final answer
   x = 23,691.99