Finding the Fourth Proportional to 30,559.32, 42,171.72 and 17,130.56

Step by Step Solution

1. Step 1: Write the proportion equation
   30,559.32 : 42,171.72 = 17,130.56 : x
2. Step 2: Convert to fraction form
   30,559.32/42,171.72 = 17,130.56/x
3. Step 3: Cross multiply
   30,559.32x = 42,171.72 × 17,130.56
4. Step 4: Simplify right side
   30,559.32x = 722,425,179.76
5. Step 5: Solve for x
   x = 722,425,179.76/30,559.32
6. Step 6: Final answer
   x = 23,640.09