Finding the Fourth Proportional to 30,538.56, 42,140.72 and 17,108.72

Step by Step Solution

1. Step 1: Write the proportion equation
   30,538.56 : 42,140.72 = 17,108.72 : x
2. Step 2: Convert to fraction form
   30,538.56/42,140.72 = 17,108.72/x
3. Step 3: Cross multiply
   30,538.56x = 42,140.72 × 17,108.72
4. Step 4: Simplify right side
   30,538.56x = 720,973,779.08
5. Step 5: Solve for x
   x = 720,973,779.08/30,538.56
6. Step 6: Final answer
   x = 23,608.64