Finding the Fourth Proportional to 31,603.10, 43,612.17 and 18,173.72

Step by Step Solution

1. Step 1: Write the proportion equation
   31,603.10 : 43,612.17 = 18,173.72 : x
2. Step 2: Convert to fraction form
   31,603.10/43,612.17 = 18,173.72/x
3. Step 3: Cross multiply
   31,603.10x = 43,612.17 × 18,173.72
4. Step 4: Simplify right side
   31,603.10x = 792,595,366.17
5. Step 5: Solve for x
   x = 792,595,366.17/31,603.10
6. Step 6: Final answer
   x = 25,079.67