Finding the Fourth Proportional to 30,901.72, 42,629.32 and 18,317.56

Step by Step Solution

1. Step 1: Write the proportion equation
   30,901.72 : 42,629.32 = 18,317.56 : x
2. Step 2: Convert to fraction form
   30,901.72/42,629.32 = 18,317.56/x
3. Step 3: Cross multiply
   30,901.72x = 42,629.32 × 18,317.56
4. Step 4: Simplify right side
   30,901.72x = 780,865,126.86
5. Step 5: Solve for x
   x = 780,865,126.86/30,901.72
6. Step 6: Final answer
   x = 25,269.31